656407747 has 2 divisors, whose sum is σ = 656407748. Its totient is φ = 656407746.

The previous prime is 656407699. The next prime is 656407753. The reversal of 656407747 is 747704656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656407747 is a prime.

It is a super-2 number, since 2×656407747² = 861742260643232018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656407697 and 656407706.

It is not a weakly prime, because it can be changed into another prime (656405747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328203873 + 328203874.

It is an arithmetic number, because the mean of its divisors is an integer number (328203874).

Almost surely, 2^656407747 is an apocalyptic number.

656407747 is a deficient number, since it is larger than the sum of its proper divisors (1).

656407747 is an equidigital number, since it uses as much as digits as its factorization.

656407747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 46.

The square root of 656407747 is about 25620.4556360733. The cubic root of 656407747 is about 869.0762852020.

The spelling of 656407747 in words is "six hundred fifty-six million, four hundred seven thousand, seven hundred forty-seven".