56105531556 has 12 divisors (see below), whose sum is σ = 130912906992. Its totient is φ = 18701843848.

The previous prime is 56105531549. The next prime is 56105531557. The reversal of 56105531556 is 65513550165.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×56105531556² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56105531557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2337730470 + ... + 2337730493.

It is an arithmetic number, because the mean of its divisors is an integer number (10909408916).

Almost surely, 2^56105531556 is an apocalyptic number.

It is an amenable number.

56105531556 is an abundant number, since it is smaller than the sum of its proper divisors (74807375436).

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

56105531556 is a wasteful number, since it uses less digits than its factorization.

56105531556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4675460970 (or 4675460968 counting only the distinct ones).

The product of its (nonzero) digits is 337500, while the sum is 42.

The spelling of 56105531556 in words is "fifty-six billion, one hundred five million, five hundred thirty-one thousand, five hundred fifty-six".