51200072056 has 32 divisors (see below), whose sum is σ = 109737468000. Its totient is φ = 21938282496.

The previous prime is 51200072051. The next prime is 51200072057. The reversal of 51200072056 is 65027000215.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51200072051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180280 + ... + 367288.

It is an arithmetic number, because the mean of its divisors is an integer number (3429295875).

Almost surely, 2^51200072056 is an apocalyptic number.

51200072056 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51200072056 is an abundant number, since it is smaller than the sum of its proper divisors (58537395944).

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

51200072056 is a wasteful number, since it uses less digits than its factorization.

51200072056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191911 (or 191907 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The spelling of 51200072056 in words is "fifty-one billion, two hundred million, seventy-two thousand, fifty-six".