51556505100 has 72 divisors (see below), whose sum is σ = 149197065360. Its totient is φ = 13745921280.

The previous prime is 51556505093. The next prime is 51556505141. The reversal of 51556505100 is 150565515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2156814 + ... + 2180586.

Almost surely, 2^51556505100 is an apocalyptic number.

51556505100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51556505100 is an abundant number, since it is smaller than the sum of its proper divisors (97640560260).

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

51556505100 is a wasteful number, since it uses less digits than its factorization.

51556505100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31019 (or 31012 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 51556505100 in words is "fifty-one billion, five hundred fifty-six million, five hundred five thousand, one hundred".