656755549 has 2 divisors, whose sum is σ = 656755550. Its totient is φ = 656755548.

The previous prime is 656755499. The next prime is 656755571. The reversal of 656755549 is 945557656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507060324 + 149695225 = 22518^2 + 12235^2 .

It is a cyclic number.

It is not a de Polignac number, because 656755549 - 2⁹ = 656755037 is a prime.

It is a super-2 number, since 2×656755549² = 862655702284582802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656755496 and 656755505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656755249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328377774 + 328377775.

It is an arithmetic number, because the mean of its divisors is an integer number (328377775).

Almost surely, 2^656755549 is an apocalyptic number.

It is an amenable number.

656755549 is a deficient number, since it is larger than the sum of its proper divisors (1).

656755549 is an equidigital number, since it uses as much as digits as its factorization.

656755549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670000, while the sum is 52.

The square root of 656755549 is about 25627.2423214048. The cubic root of 656755549 is about 869.2297533785.

The spelling of 656755549 in words is "six hundred fifty-six million, seven hundred fifty-five thousand, five hundred forty-nine".