51660657072615 has 16 divisors (see below), whose sum is σ = 82657142949888. Its totient is φ = 27552319894176.

The previous prime is 51660657072611. The next prime is 51660657072643. The reversal of 51660657072615 is 51627075606615.

It is not a de Polignac number, because 51660657072615 - 2² = 51660657072611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660657072611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20742774 + ... + 23099436.

It is an arithmetic number, because the mean of its divisors is an integer number (5166071434368).

Almost surely, 2^{51660657072615} is an apocalyptic number.

51660657072615 is a deficient number, since it is larger than the sum of its proper divisors (30996485877273).

51660657072615 is a wasteful number, since it uses less digits than its factorization.

51660657072615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3818078.

The product of its (nonzero) digits is 15876000, while the sum is 57.

The spelling of 51660657072615 in words is "fifty-one trillion, six hundred sixty billion, six hundred fifty-seven million, seventy-two thousand, six hundred fifteen".