656709791 has 2 divisors, whose sum is σ = 656709792. Its totient is φ = 656709790.

The previous prime is 656709733. The next prime is 656709793. The reversal of 656709791 is 197907656.

656709791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656709791 - 2²⁶ = 589600927 is a prime.

Together with 656709793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656709793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328354895 + 328354896.

It is an arithmetic number, because the mean of its divisors is an integer number (328354896).

Almost surely, 2^656709791 is an apocalyptic number.

656709791 is a deficient number, since it is larger than the sum of its proper divisors (1).

656709791 is an equidigital number, since it uses as much as digits as its factorization.

656709791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 714420, while the sum is 50.

The square root of 656709791 is about 25626.3495449508. The cubic root of 656709791 is about 869.2095656852.

The spelling of 656709791 in words is "six hundred fifty-six million, seven hundred nine thousand, seven hundred ninety-one".