656797943 has 2 divisors, whose sum is σ = 656797944. Its totient is φ = 656797942.

The previous prime is 656797931. The next prime is 656797957. The reversal of 656797943 is 349797656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656797943 - 2⁴ = 656797927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656797903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328398971 + 328398972.

It is an arithmetic number, because the mean of its divisors is an integer number (328398972).

Almost surely, 2^656797943 is an apocalyptic number.

656797943 is a deficient number, since it is larger than the sum of its proper divisors (1).

656797943 is an equidigital number, since it uses as much as digits as its factorization.

656797943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 56.

The square root of 656797943 is about 25628.0694356793. The cubic root of 656797943 is about 869.2484560923.

The spelling of 656797943 in words is "six hundred fifty-six million, seven hundred ninety-seven thousand, nine hundred forty-three".