51245773137 has 12 divisors (see below), whose sum is σ = 79715647284. Its totient is φ = 31535860320.

The previous prime is 51245773129. The next prime is 51245773157. The reversal of 51245773137 is 73137754215.

51245773137 is a `hidden beast` number, since 5 + 12 + 4 + 577 + 31 + 37 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3247974081 + 47997799056 = 56991^2 + 219084^2 .

It is not a de Polignac number, because 51245773137 - 2³ = 51245773129 is a prime.

It is a super-2 number, since 2×51245773137² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51245773092 and 51245773101.

It is not an unprimeable number, because it can be changed into a prime (51245773127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 218998914 + ... + 218999147.

It is an arithmetic number, because the mean of its divisors is an integer number (6642970607).

Almost surely, 2^51245773137 is an apocalyptic number.

It is an amenable number.

51245773137 is a deficient number, since it is larger than the sum of its proper divisors (28469874147).

51245773137 is a wasteful number, since it uses less digits than its factorization.

51245773137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437998080 (or 437998077 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The spelling of 51245773137 in words is "fifty-one billion, two hundred forty-five million, seven hundred seventy-three thousand, one hundred thirty-seven".