656940775 has 12 divisors (see below), whose sum is σ = 862525152. Its totient is φ = 494637440.

The previous prime is 656940769. The next prime is 656940793. The reversal of 656940775 is 577049656.

It is not a de Polignac number, because 656940775 - 2²⁵ = 623386343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 772447 + ... + 773296.

It is an arithmetic number, because the mean of its divisors is an integer number (71877096).

Almost surely, 2^656940775 is an apocalyptic number.

656940775 is a deficient number, since it is larger than the sum of its proper divisors (205584377).

656940775 is a wasteful number, since it uses less digits than its factorization.

656940775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545770 (or 1545765 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 49.

The square root of 656940775 is about 25630.8559162584. The cubic root of 656940775 is about 869.3114625303.

The spelling of 656940775 in words is "six hundred fifty-six million, nine hundred forty thousand, seven hundred seventy-five".