51085115944 has 8 divisors (see below), whose sum is σ = 95784592410. Its totient is φ = 25542557968.

The previous prime is 51085115941. The next prime is 51085115951. The reversal of 51085115944 is 44951158015.

It can be written as a sum of positive squares in only one way, i.e., 50890848100 + 194267844 = 225590^2 + 13938^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×51085115944² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51085115944.

It is not an unprimeable number, because it can be changed into a prime (51085115941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3192819739 + ... + 3192819754.

Almost surely, 2^51085115944 is an apocalyptic number.

It is an amenable number.

51085115944 is a deficient number, since it is larger than the sum of its proper divisors (44699476466).

51085115944 is a wasteful number, since it uses less digits than its factorization.

51085115944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6385639499 (or 6385639495 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 43.

The spelling of 51085115944 in words is "fifty-one billion, eighty-five million, one hundred fifteen thousand, nine hundred forty-four".