51661136776515 has 32 divisors (see below), whose sum is σ = 97723529671680. Its totient is φ = 22802156920704.

The previous prime is 51661136776507. The next prime is 51661136776577. The reversal of 51661136776515 is 51567763116615.

It is not a de Polignac number, because 51661136776515 - 2³ = 51661136776507 is a prime.

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, 8482942239 + ... + 8482948328.

It is an arithmetic number, because the mean of its divisors is an integer number (3053860302240).

Almost surely, 2^{51661136776515} is an apocalyptic number.

51661136776515 is a deficient number, since it is larger than the sum of its proper divisors (46062392895165).

51661136776515 is a wasteful number, since it uses less digits than its factorization.

51661136776515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16965890611.

The product of its digits is 23814000, while the sum is 60.

The spelling of 51661136776515 in words is "fifty-one trillion, six hundred sixty-one billion, one hundred thirty-six million, seven hundred seventy-six thousand, five hundred fifteen".