51715536761 has 32 divisors (see below), whose sum is σ = 60453457920. Its totient is φ = 43326936576.

The previous prime is 51715536737. The next prime is 51715536767. The reversal of 51715536761 is 16763551715.

It is a de Polignac number, because none of the positive numbers 2^k-51715536761 is a prime.

It is a super-2 number, since 2×51715536761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51715536767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39567470 + ... + 39568776.

It is an arithmetic number, because the mean of its divisors is an integer number (1889170560).

Almost surely, 2^51715536761 is an apocalyptic number.

It is an amenable number.

51715536761 is a deficient number, since it is larger than the sum of its proper divisors (8737921159).

51715536761 is a wasteful number, since it uses less digits than its factorization.

51715536761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its digits is 661500, while the sum is 47.

The spelling of 51715536761 in words is "fifty-one billion, seven hundred fifteen million, five hundred thirty-six thousand, seven hundred sixty-one".