56665515516 has 12 divisors (see below), whose sum is σ = 132219536232. Its totient is φ = 18888505168.

The previous prime is 56665515461. The next prime is 56665515617. The reversal of 56665515516 is 61551556665.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361063135 + ... + 2361063158.

It is an arithmetic number, because the mean of its divisors is an integer number (11018294686).

Almost surely, 2^56665515516 is an apocalyptic number.

It is an amenable number.

56665515516 is an abundant number, since it is smaller than the sum of its proper divisors (75554020716).

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

56665515516 is a wasteful number, since it uses less digits than its factorization.

56665515516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722126300 (or 4722126298 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 51.

The spelling of 56665515516 in words is "fifty-six billion, six hundred sixty-five million, five hundred fifteen thousand, five hundred sixteen".