51561020103513 has 8 divisors (see below), whose sum is σ = 68748658008576. Its totient is φ = 34373697800400.

The previous prime is 51561020103493. The next prime is 51561020103517. The reversal of 51561020103513 is 31530102016515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51561020103513 - 2²⁴ = 51561003326297 is a prime.

It is a super-2 number, since 2×51561020103513² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51561020103517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78519018 + ... + 79172963.

It is an arithmetic number, because the mean of its divisors is an integer number (8593582251072).

Almost surely, 2^{51561020103513} is an apocalyptic number.

It is an amenable number.

51561020103513 is a deficient number, since it is larger than the sum of its proper divisors (17187637905063).

51561020103513 is a wasteful number, since it uses less digits than its factorization.

51561020103513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157800975.

The product of its (nonzero) digits is 13500, while the sum is 33.

The spelling of 51561020103513 in words is "fifty-one trillion, five hundred sixty-one billion, twenty million, one hundred three thousand, five hundred thirteen".