51688983700 has 18 divisors (see below), whose sum is σ = 112165094846. Its totient is φ = 20675593440.

The previous prime is 51688983677. The next prime is 51688983733. The reversal of 51688983700 is 738988615.

It can be written as a sum of positive squares in 3 ways, for example, as 8917780356 + 42771203344 = 94434^2 + 206812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258444819 + ... + 258445018.

Almost surely, 2^51688983700 is an apocalyptic number.

51688983700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51688983700 is an abundant number, since it is smaller than the sum of its proper divisors (60476111146).

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

51688983700 is a wasteful number, since it uses less digits than its factorization.

51688983700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516889851 (or 516889844 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 51688983700 in words is "fifty-one billion, six hundred eighty-eight million, nine hundred eighty-three thousand, seven hundred".