51500855844 has 81 divisors (see below), whose sum is σ = 131767744017. Its totient is φ = 16960438368.

The previous prime is 51500855801. The next prime is 51500855863. The reversal of 51500855844 is 44855800515.

The square root of 51500855844 is 226938.

It is a perfect power (a square), and thus also a powerful number.

51500855844 is a `hidden beast` number, since 5 + 1 + 50 + 0 + 8 + 558 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35895849444 + 15605006400 = 189462^2 + 124920^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51500855844.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 148417279 + ... + 148417625.

Almost surely, 2^51500855844 is an apocalyptic number.

51500855844 is the 226938-th square number.

It is an amenable number.

51500855844 is an abundant number, since it is smaller than the sum of its proper divisors (80266888173).

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

51500855844 is a wasteful number, since it uses less digits than its factorization.

51500855844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 640000, while the sum is 45.

The spelling of 51500855844 in words is "fifty-one billion, five hundred million, eight hundred fifty-five thousand, eight hundred forty-four".