665500056 has 64 divisors (see below), whose sum is σ = 1840188000. Its totient is φ = 199231488.

The previous prime is 665500013. The next prime is 665500067. The reversal of 665500056 is 650005566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17281 + ... + 40368.

Almost surely, 2^665500056 is an apocalyptic number.

It is an amenable number.

665500056 is an abundant number, since it is smaller than the sum of its proper divisors (1174687944).

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

665500056 is a wasteful number, since it uses less digits than its factorization.

665500056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57708 (or 57704 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 665500056 is about 25797.2877644143. The cubic root of 665500056 is about 873.0706030713.

The spelling of 665500056 in words is "six hundred sixty-five million, five hundred thousand, fifty-six".