656610454589 has 2 divisors, whose sum is σ = 656610454590. Its totient is φ = 656610454588.

The previous prime is 656610454567. The next prime is 656610454607. The reversal of 656610454589 is 985454016656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 592502746564 + 64107708025 = 769742^2 + 253195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656610454589 is a prime.

It is a super-2 number, since 2×656610454589² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656610454889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328305227294 + 328305227295.

It is an arithmetic number, because the mean of its divisors is an integer number (328305227295).

Almost surely, 2^656610454589 is an apocalyptic number.

It is an amenable number.

656610454589 is a deficient number, since it is larger than the sum of its proper divisors (1).

656610454589 is an equidigital number, since it uses as much as digits as its factorization.

656610454589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104000, while the sum is 59.

The spelling of 656610454589 in words is "six hundred fifty-six billion, six hundred ten million, four hundred fifty-four thousand, five hundred eighty-nine".