656407069 has 2 divisors, whose sum is σ = 656407070. Its totient is φ = 656407068.

The previous prime is 656407057. The next prime is 656407091. The reversal of 656407069 is 960704656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 339922969 + 316484100 = 18437^2 + 17790^2 .

It is a cyclic number.

It is not a de Polignac number, because 656407069 - 2⁹ = 656406557 is a prime.

It is a super-2 number, since 2×656407069² = 861740480466341522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656407039) 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, 328203534 + 328203535.

It is an arithmetic number, because the mean of its divisors is an integer number (328203535).

Almost surely, 2^656407069 is an apocalyptic number.

It is an amenable number.

656407069 is a deficient number, since it is larger than the sum of its proper divisors (1).

656407069 is an equidigital number, since it uses as much as digits as its factorization.

656407069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 656407069 is about 25620.4424044551. The cubic root of 656407069 is about 869.0759859805.

The spelling of 656407069 in words is "six hundred fifty-six million, four hundred seven thousand, sixty-nine".