656355643 has 2 divisors, whose sum is σ = 656355644. Its totient is φ = 656355642.

The previous prime is 656355631. The next prime is 656355649. The reversal of 656355643 is 346553656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656355643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656355643.

It is not a weakly prime, because it can be changed into another prime (656355649) 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, 328177821 + 328177822.

It is an arithmetic number, because the mean of its divisors is an integer number (328177822).

Almost surely, 2^656355643 is an apocalyptic number.

656355643 is a deficient number, since it is larger than the sum of its proper divisors (1).

656355643 is an equidigital number, since it uses as much as digits as its factorization.

656355643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972000, while the sum is 43.

The square root of 656355643 is about 25619.4387721511. The cubic root of 656355643 is about 869.0532895619.

The spelling of 656355643 in words is "six hundred fifty-six million, three hundred fifty-five thousand, six hundred forty-three".