51521164635136 has 44 divisors (see below), whose sum is σ = 117705160739728. Its totient is φ = 22080499126272.

The previous prime is 51521164635113. The next prime is 51521164635137. The reversal of 51521164635136 is 63153646112515.

It is a self number, because there is not a number n which added to its sum of digits gives 51521164635136.

It is not an unprimeable number, because it can be changed into a prime (51521164635137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3593824071 + ... + 3593838406.

Almost surely, 2^{51521164635136} is an apocalyptic number.

51521164635136 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51521164635136 is an abundant number, since it is smaller than the sum of its proper divisors (66183996104592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51521164635136 is an equidigital number, since it uses as much as digits as its factorization.

51521164635136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187662504 (or 7187662486 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 49.

The spelling of 51521164635136 in words is "fifty-one trillion, five hundred twenty-one billion, one hundred sixty-four million, six hundred thirty-five thousand, one hundred thirty-six".