61716515311657 has 2 divisors, whose sum is σ = 61716515311658. Its totient is φ = 61716515311656.

The previous prime is 61716515311609. The next prime is 61716515311699. The reversal of 61716515311657 is 75611351561716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58253209199641 + 3463306112016 = 7632379^2 + 1860996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61716515311657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61716515311598 and 61716515311607.

It is not a weakly prime, because it can be changed into another prime (61716515311057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30858257655828 + 30858257655829.

It is an arithmetic number, because the mean of its divisors is an integer number (30858257655829).

Almost surely, 2^{61716515311657} is an apocalyptic number.

It is an amenable number.

61716515311657 is a deficient number, since it is larger than the sum of its proper divisors (1).

61716515311657 is an equidigital number, since it uses as much as digits as its factorization.

61716515311657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3969000, while the sum is 55.

The spelling of 61716515311657 in words is "sixty-one trillion, seven hundred sixteen billion, five hundred fifteen million, three hundred eleven thousand, six hundred fifty-seven".