51327510813 has 10 divisors (see below), whose sum is σ = 76674429854. Its totient is φ = 34218340488.

The previous prime is 51327510811. The next prime is 51327510827. The reversal of 51327510813 is 31801572315.

It is a happy number.

51327510813 is a `hidden beast` number, since 5 + 132 + 7 + 510 + 8 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40944308409 + 10383202404 = 202347^2 + 101898^2 .

It is not a de Polignac number, because 51327510813 - 2¹ = 51327510811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51327510811) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 316836406 + ... + 316836567.

Almost surely, 2^51327510813 is an apocalyptic number.

It is an amenable number.

51327510813 is a deficient number, since it is larger than the sum of its proper divisors (25346919041).

51327510813 is an equidigital number, since it uses as much as digits as its factorization.

51327510813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633672985 (or 633672976 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 51327510813 in words is "fifty-one billion, three hundred twenty-seven million, five hundred ten thousand, eight hundred thirteen".