51868384731 has 12 divisors (see below), whose sum is σ = 77337807040. Its totient is φ = 33463473840.

The previous prime is 51868384727. The next prime is 51868384781. The reversal of 51868384731 is 13748386815.

It is a happy number.

51868384731 is a `hidden beast` number, since 518 + 6 + 83 + 8 + 47 + 3 + 1 = 666.

It is not a de Polignac number, because 51868384731 - 2² = 51868384727 is a prime.

It is a super-2 number, since 2×51868384731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51868384781) 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, 92953816 + ... + 92954373.

Almost surely, 2^51868384731 is an apocalyptic number.

51868384731 is a deficient number, since it is larger than the sum of its proper divisors (25469422309).

51868384731 is a wasteful number, since it uses less digits than its factorization.

51868384731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185908226 (or 185908223 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 51868384731 in words is "fifty-one billion, eight hundred sixty-eight million, three hundred eighty-four thousand, seven hundred thirty-one".