51551311315515 has 32 divisors (see below), whose sum is σ = 89982530145792. Its totient is φ = 24994003104000.

The previous prime is 51551311315507. The next prime is 51551311315541.

51551311315515 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51551311315515 - 2³ = 51551311315507 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3700050 + ... + 10807080.

It is an arithmetic number, because the mean of its divisors is an integer number (2811954067056).

Almost surely, 2^{51551311315515} is an apocalyptic number.

51551311315515 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51551311315515 is a deficient number, since it is larger than the sum of its proper divisors (38431218830277).

51551311315515 is a wasteful number, since it uses less digits than its factorization.

51551311315515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7151011.

The product of its digits is 140625, while the sum is 42.

The spelling of 51551311315515 in words is "fifty-one trillion, five hundred fifty-one billion, three hundred eleven million, three hundred fifteen thousand, five hundred fifteen".