656343641 has 2 divisors, whose sum is σ = 656343642. Its totient is φ = 656343640.

The previous prime is 656343607. The next prime is 656343661. The reversal of 656343641 is 146343656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644093641 + 12250000 = 25379^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 656343641 - 2⁶ = 656343577 is a prime.

It is a super-2 number, since 2×656343641² = 861573950162273762, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 656343595 and 656343604.

It is not a weakly prime, because it can be changed into another prime (656343661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328171820 + 328171821.

It is an arithmetic number, because the mean of its divisors is an integer number (328171821).

Almost surely, 2^656343641 is an apocalyptic number.

It is an amenable number.

656343641 is a deficient number, since it is larger than the sum of its proper divisors (1).

656343641 is an equidigital number, since it uses as much as digits as its factorization.

656343641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 38.

The square root of 656343641 is about 25619.2045348797. The cubic root of 656343641 is about 869.0479924128.

The spelling of 656343641 in words is "six hundred fifty-six million, three hundred forty-three thousand, six hundred forty-one".