51000500556 has 24 divisors (see below), whose sum is σ = 132223520240. Its totient is φ = 17000166816.

The previous prime is 51000500503. The next prime is 51000500569. The reversal of 51000500556 is 65500500015.

51000500556 is a `hidden beast` number, since 5 + 100 + 0 + 5 + 0 + 0 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236113321 + ... + 236113536.

Almost surely, 2^51000500556 is an apocalyptic number.

It is an amenable number.

51000500556 is an abundant number, since it is smaller than the sum of its proper divisors (81223019684).

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

51000500556 is a wasteful number, since it uses less digits than its factorization.

51000500556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472226870 (or 472226862 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The spelling of 51000500556 in words is "fifty-one billion, five hundred thousand, five hundred fifty-six".