51511510115 has 16 divisors (see below), whose sum is σ = 66962632800. Its totient is φ = 38039260896.

The previous prime is 51511510091. The next prime is 51511510123. The reversal of 51511510115 is 51101511515.

It is not a de Polignac number, because 51511510115 - 2⁸ = 51511509859 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2333645 + ... + 2355614.

It is an arithmetic number, because the mean of its divisors is an integer number (4185164550).

Almost surely, 2^51511510115 is an apocalyptic number.

51511510115 is a deficient number, since it is larger than the sum of its proper divisors (15451122685).

51511510115 is an equidigital number, since it uses as much as digits as its factorization.

51511510115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689303 (or 4689277 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 26.

The spelling of 51511510115 in words is "fifty-one billion, five hundred eleven million, five hundred ten thousand, one hundred fifteen".