51717306311721 has 32 divisors (see below), whose sum is σ = 76648620280320. Its totient is φ = 34464532180752.

The previous prime is 51717306311707. The next prime is 51717306311731. The reversal of 51717306311721 is 12711360371715.

51717306311721 is a `hidden beast` number, since 5 + 1 + 7 + 1 + 7 + 3 + 0 + 631 + 1 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 51717306311721 - 2¹³ = 51717306303529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51717306311731) 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, 740614210 + ... + 740684036.

It is an arithmetic number, because the mean of its divisors is an integer number (2395269383760).

Almost surely, 2^{51717306311721} is an apocalyptic number.

It is an amenable number.

51717306311721 is a deficient number, since it is larger than the sum of its proper divisors (24931313968599).

51717306311721 is a wasteful number, since it uses less digits than its factorization.

51717306311721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80322 (or 80316 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 45.

The spelling of 51717306311721 in words is "fifty-one trillion, seven hundred seventeen billion, three hundred six million, three hundred eleven thousand, seven hundred twenty-one".