656396791 has 4 divisors (see below), whose sum is σ = 656816184. Its totient is φ = 655977400.

The previous prime is 656396731. The next prime is 656396803. The reversal of 656396791 is 197693656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656396791 - 2¹³ = 656388599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656396731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207340 + ... + 210481.

It is an arithmetic number, because the mean of its divisors is an integer number (164204046).

Almost surely, 2^656396791 is an apocalyptic number.

656396791 is a deficient number, since it is larger than the sum of its proper divisors (419393).

656396791 is a wasteful number, since it uses less digits than its factorization.

656396791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419392.

The product of its digits is 1837080, while the sum is 52.

The square root of 656396791 is about 25620.2418216534. The cubic root of 656396791 is about 869.0714499692.

The spelling of 656396791 in words is "six hundred fifty-six million, three hundred ninety-six thousand, seven hundred ninety-one".