56055666566556 has 18 divisors (see below), whose sum is σ = 141696268265552. Its totient is φ = 18685222188840.

The previous prime is 56055666566539. The next prime is 56055666566597. The reversal of 56055666566556 is 65566566655065.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×56055666566556² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 778550924500 + ... + 778550924571.

Almost surely, 2^{56055666566556} is an apocalyptic number.

It is an amenable number.

56055666566556 is an abundant number, since it is smaller than the sum of its proper divisors (85640601698996).

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

56055666566556 is a wasteful number, since it uses less digits than its factorization.

56055666566556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557101849081 (or 1557101849076 counting only the distinct ones).

The product of its (nonzero) digits is 4374000000, while the sum is 72.

The spelling of 56055666566556 in words is "fifty-six trillion, fifty-five billion, six hundred sixty-six million, five hundred sixty-six thousand, five hundred fifty-six".