51310181840 has 40 divisors (see below), whose sum is σ = 119339344680. Its totient is φ = 20516645376.

The previous prime is 51310181831. The next prime is 51310181851. The reversal of 51310181840 is 4818101315.

It can be written as a sum of positive squares in 4 ways, for example, as 319122496 + 50991059344 = 17864^2 + 225812^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 51310181797 and 51310181806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109106 + ... + 338414.

It is an arithmetic number, because the mean of its divisors is an integer number (2983483617).

Almost surely, 2^51310181840 is an apocalyptic number.

It is an amenable number.

51310181840 is an abundant number, since it is smaller than the sum of its proper divisors (68029162840).

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

51310181840 is a wasteful number, since it uses less digits than its factorization.

51310181840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232119 (or 232113 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 51310181840 in words is "fifty-one billion, three hundred ten million, one hundred eighty-one thousand, eight hundred forty".