656243650057 has 2 divisors, whose sum is σ = 656243650058. Its totient is φ = 656243650056.

The previous prime is 656243650043. The next prime is 656243650147. The reversal of 656243650057 is 750056342656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596268129856 + 59975520201 = 772184^2 + 244899^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656243650057 is a prime.

It is a super-2 number, since 2×656243650057² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (656243650037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328121825028 + 328121825029.

It is an arithmetic number, because the mean of its divisors is an integer number (328121825029).

Almost surely, 2^656243650057 is an apocalyptic number.

It is an amenable number.

656243650057 is a deficient number, since it is larger than the sum of its proper divisors (1).

656243650057 is an equidigital number, since it uses as much as digits as its factorization.

656243650057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 49.

The spelling of 656243650057 in words is "six hundred fifty-six billion, two hundred forty-three million, six hundred fifty thousand, fifty-seven".