656707655 has 4 divisors (see below), whose sum is σ = 788049192. Its totient is φ = 525366120.

The previous prime is 656707643. The next prime is 656707657. The reversal of 656707655 is 556707656.

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

It is not a de Polignac number, because 656707655 - 2⁶ = 656707591 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 (656707657) 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, 65670761 + ... + 65670770.

It is an arithmetic number, because the mean of its divisors is an integer number (197012298).

Almost surely, 2^656707655 is an apocalyptic number.

656707655 is a deficient number, since it is larger than the sum of its proper divisors (131341537).

656707655 is a wasteful number, since it uses less digits than its factorization.

656707655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131341536.

The product of its (nonzero) digits is 1323000, while the sum is 47.

The square root of 656707655 is about 25626.3078690630. The cubic root of 656707655 is about 869.2086232934.

Subtracting from 656707655 its reverse (556707656), we obtain a palindrome (99999999).

The spelling of 656707655 in words is "six hundred fifty-six million, seven hundred seven thousand, six hundred fifty-five".