1220404225545 has 48 divisors (see below), whose sum is σ = 2120187768192. Its totient is φ = 649400544000.

The previous prime is 1220404225511. The next prime is 1220404225549. The reversal of 1220404225545 is 5455224040221.

1220404225545 is a `hidden beast` number, since 1 + 2 + 20 + 40 + 42 + 2 + 554 + 5 = 666.

It is not a de Polignac number, because 1220404225545 - 2¹⁶ = 1220404160009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220404225549) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41707170 + ... + 41736420.

It is an arithmetic number, because the mean of its divisors is an integer number (44170578504).

Almost surely, 2^{1220404225545} is an apocalyptic number.

1220404225545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220404225545 is a deficient number, since it is larger than the sum of its proper divisors (899783542647).

1220404225545 is a wasteful number, since it uses less digits than its factorization.

1220404225545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31342 (or 31339 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 36.

Adding to 1220404225545 its reverse (5455224040221), we get a palindrome (6675628265766).

The spelling of 1220404225545 in words is "one trillion, two hundred twenty billion, four hundred four million, two hundred twenty-five thousand, five hundred forty-five".