51751711657 has 2 divisors, whose sum is σ = 51751711658. Its totient is φ = 51751711656.

The previous prime is 51751711639. The next prime is 51751711667. The reversal of 51751711657 is 75611715715.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31389563241 + 20362148416 = 177171^2 + 142696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51751711657 is a prime.

It is not a weakly prime, because it can be changed into another prime (51751711607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25875855828 + 25875855829.

It is an arithmetic number, because the mean of its divisors is an integer number (25875855829).

Almost surely, 2^51751711657 is an apocalyptic number.

It is an amenable number.

51751711657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51751711657 is an equidigital number, since it uses as much as digits as its factorization.

51751711657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 257250, while the sum is 46.

The spelling of 51751711657 in words is "fifty-one billion, seven hundred fifty-one million, seven hundred eleven thousand, six hundred fifty-seven".