656768977 has 4 divisors (see below), whose sum is σ = 656871280. Its totient is φ = 656666676.

The previous prime is 656768969. The next prime is 656768989. The reversal of 656768977 is 779867656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656768977 - 2³ = 656768969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656768947) 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, 40827 + ... + 54592.

It is an arithmetic number, because the mean of its divisors is an integer number (164217820).

Almost surely, 2^656768977 is an apocalyptic number.

It is an amenable number.

656768977 is a deficient number, since it is larger than the sum of its proper divisors (102303).

656768977 is an equidigital number, since it uses as much as digits as its factorization.

656768977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102302.

The product of its digits is 26671680, while the sum is 61.

The square root of 656768977 is about 25627.5043068965. The cubic root of 656768977 is about 869.2356774181.

The spelling of 656768977 in words is "six hundred fifty-six million, seven hundred sixty-eight thousand, nine hundred seventy-seven".