56606515657 has 2 divisors, whose sum is σ = 56606515658. Its totient is φ = 56606515656.

The previous prime is 56606515613. The next prime is 56606515661. The reversal of 56606515657 is 75651560665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36502395136 + 20104120521 = 191056^2 + 141789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56606515657 is a prime.

It is a super-2 number, since 2×56606515657² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56606515157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28303257828 + 28303257829.

It is an arithmetic number, because the mean of its divisors is an integer number (28303257829).

Almost surely, 2^56606515657 is an apocalyptic number.

It is an amenable number.

56606515657 is a deficient number, since it is larger than the sum of its proper divisors (1).

56606515657 is an equidigital number, since it uses as much as digits as its factorization.

56606515657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670000, while the sum is 52.

The spelling of 56606515657 in words is "fifty-six billion, six hundred six million, five hundred fifteen thousand, six hundred fifty-seven".