51000701556 has 96 divisors (see below), whose sum is σ = 146940998400. Its totient is φ = 13714455552.

The previous prime is 51000701533. The next prime is 51000701603. The reversal of 51000701556 is 65510700015.

It is a super-2 number, since 2×51000701556² (a number of 22 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 31 ways as a sum of consecutive naturals, for example, 294465 + ... + 434408.

It is an arithmetic number, because the mean of its divisors is an integer number (1530635400).

Almost surely, 2^51000701556 is an apocalyptic number.

It is an amenable number.

51000701556 is an abundant number, since it is smaller than the sum of its proper divisors (95940296844).

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

51000701556 is a wasteful number, since it uses less digits than its factorization.

51000701556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728918 (or 728902 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 30.

The spelling of 51000701556 in words is "fifty-one billion, seven hundred one thousand, five hundred fifty-six".