51008660631 has 40 divisors (see below), whose sum is σ = 81405857280. Its totient is φ = 31735096272.

The previous prime is 51008660617. The next prime is 51008660639. The reversal of 51008660631 is 13606680015.

It is a happy number.

51008660631 is a `hidden beast` number, since 5 + 10 + 0 + 8 + 6 + 6 + 0 + 631 = 666.

51008660631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51008660631 - 2²² = 51004466327 is a prime.

It is a super-2 number, since 2×51008660631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51008660639) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 144231 + ... + 350456.

It is an arithmetic number, because the mean of its divisors is an integer number (2035146432).

Almost surely, 2^51008660631 is an apocalyptic number.

51008660631 is a deficient number, since it is larger than the sum of its proper divisors (30397196649).

51008660631 is a wasteful number, since it uses less digits than its factorization.

51008660631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494785 (or 494776 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 51008660631 in words is "fifty-one billion, eight million, six hundred sixty thousand, six hundred thirty-one".