1223632665 has 12 divisors (see below), whose sum is σ = 2120963364. Its totient is φ = 652604064.

The previous prime is 1223632649. The next prime is 1223632667. The reversal of 1223632665 is 5662363221.

1223632665 is a `hidden beast` number, since 12 + 2 + 3 + 632 + 6 + 6 + 5 = 666.

1223632665 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 920454921 + 303177744 = 30339^2 + 17412^2 .

It is not a de Polignac number, because 1223632665 - 2⁴ = 1223632649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1223632667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13595874 + ... + 13595963.

It is an arithmetic number, because the mean of its divisors is an integer number (176746947).

Almost surely, 2^1223632665 is an apocalyptic number.

1223632665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223632665 is a deficient number, since it is larger than the sum of its proper divisors (897330699).

1223632665 is a wasteful number, since it uses less digits than its factorization.

1223632665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27191848 (or 27191845 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 1223632665 is about 34980.4611890695. The cubic root of 1223632665 is about 1069.5892285894.

Adding to 1223632665 its reverse (5662363221), we get a palindrome (6885995886).

The spelling of 1223632665 in words is "one billion, two hundred twenty-three million, six hundred thirty-two thousand, six hundred sixty-five".