31561166432256 has 96 divisors (see below), whose sum is σ = 86856839596800. Its totient is φ = 10181021368320.

The previous prime is 31561166432221. The next prime is 31561166432261. The reversal of 31561166432256 is 65223466116513.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×31561166432256² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31561166432199 and 31561166432208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82662901 + ... + 83043828.

It is an arithmetic number, because the mean of its divisors is an integer number (904758745800).

Almost surely, 2^{31561166432256} is an apocalyptic number.

It is an amenable number.

31561166432256 is an abundant number, since it is smaller than the sum of its proper divisors (55295673164544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31561166432256 is a wasteful number, since it uses less digits than its factorization.

31561166432256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165706785 (or 165706765 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 51.

The spelling of 31561166432256 in words is "thirty-one trillion, five hundred sixty-one billion, one hundred sixty-six million, four hundred thirty-two thousand, two hundred fifty-six".