1223664223545 has 12 divisors (see below), whose sum is σ = 2121017987556. Its totient is φ = 652620919200.

The previous prime is 1223664223543. The next prime is 1223664223571. The reversal of 1223664223545 is 5453224663221.

1223664223545 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 66 + 42 + 2 + 3 + 545 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 879671416464 + 343992807081 = 937908^2 + 586509^2 .

It is not a de Polignac number, because 1223664223545 - 2¹ = 1223664223543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 27192538301 = 1223664223545 / (1 + 2 + 2 + 3 + 6 + 6 + 4 + 2 + 2 + 3 + 5 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1223664223545.

It is not an unprimeable number, because it can be changed into a prime (1223664223543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13596269106 + ... + 13596269195.

It is an arithmetic number, because the mean of its divisors is an integer number (176751498963).

Almost surely, 2^{1223664223545} is an apocalyptic number.

1223664223545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223664223545 is a deficient number, since it is larger than the sum of its proper divisors (897353764011).

1223664223545 is a wasteful number, since it uses less digits than its factorization.

1223664223545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27192538312 (or 27192538309 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

Adding to 1223664223545 its reverse (5453224663221), we get a palindrome (6676888886766).

It can be divided in two parts, 1223664 and 223545, that added together give a square (1447209 = 1203²).

The spelling of 1223664223545 in words is "one trillion, two hundred twenty-three billion, six hundred sixty-four million, two hundred twenty-three thousand, five hundred forty-five".