656464433 has 2 divisors, whose sum is σ = 656464434. Its totient is φ = 656464432.

The previous prime is 656464429. The next prime is 656464499. The reversal of 656464433 is 334464656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641963569 + 14500864 = 25337^2 + 3808^2 .

It is a cyclic number.

It is not a de Polignac number, because 656464433 - 2² = 656464429 is a prime.

It is a super-4 number, since 4×656464433⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (656464033) 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, 328232216 + 328232217.

It is an arithmetic number, because the mean of its divisors is an integer number (328232217).

Almost surely, 2^656464433 is an apocalyptic number.

It is an amenable number.

656464433 is a deficient number, since it is larger than the sum of its proper divisors (1).

656464433 is an equidigital number, since it uses as much as digits as its factorization.

656464433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 41.

The square root of 656464433 is about 25621.5618766694. The cubic root of 656464433 is about 869.1013016853.

The spelling of 656464433 in words is "six hundred fifty-six million, four hundred sixty-four thousand, four hundred thirty-three".