656911117 has 2 divisors, whose sum is σ = 656911118. Its totient is φ = 656911116.

The previous prime is 656911109. The next prime is 656911121. The reversal of 656911117 is 711119656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537358761 + 119552356 = 23181^2 + 10934^2 .

It is a cyclic number.

It is not a de Polignac number, because 656911117 - 2³ = 656911109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656911217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328455558 + 328455559.

It is an arithmetic number, because the mean of its divisors is an integer number (328455559).

Almost surely, 2^656911117 is an apocalyptic number.

It is an amenable number.

656911117 is a deficient number, since it is larger than the sum of its proper divisors (1).

656911117 is an equidigital number, since it uses as much as digits as its factorization.

656911117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 37.

The square root of 656911117 is about 25630.2773492602. The cubic root of 656911117 is about 869.2983804645.

The spelling of 656911117 in words is "six hundred fifty-six million, nine hundred eleven thousand, one hundred seventeen".