76561657 has 2 divisors, whose sum is σ = 76561658. Its totient is φ = 76561656.

The previous prime is 76561633. The next prime is 76561673. The reversal of 76561657 is 75616567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40908816 + 35652841 = 6396^2 + 5971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76561657 is a prime.

It is not a weakly prime, because it can be changed into another prime (76561057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38280828 + 38280829.

It is an arithmetic number, because the mean of its divisors is an integer number (38280829).

Almost surely, 2^76561657 is an apocalyptic number.

It is an amenable number.

76561657 is a deficient number, since it is larger than the sum of its proper divisors (1).

76561657 is an equidigital number, since it uses as much as digits as its factorization.

76561657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 43.

The square root of 76561657 is about 8749.9518284388. The cubic root of 76561657 is about 424.6232545950.

The spelling of 76561657 in words is "seventy-six million, five hundred sixty-one thousand, six hundred fifty-seven".