656676789 has 4 divisors (see below), whose sum is σ = 875569056. Its totient is φ = 437784524.

The previous prime is 656676781. The next prime is 656676791. The reversal of 656676789 is 987676656.

656676789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 656676789 - 2³ = 656676781 is a prime.

It is a super-2 number, since 2×656676789² = 862448810422701042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656676781) 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, 109446129 + ... + 109446134.

It is an arithmetic number, because the mean of its divisors is an integer number (218892264).

Almost surely, 2^656676789 is an apocalyptic number.

It is an amenable number.

656676789 is a deficient number, since it is larger than the sum of its proper divisors (218892267).

656676789 is a wasteful number, since it uses less digits than its factorization.

656676789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218892266.

The product of its digits is 22861440, while the sum is 60.

The square root of 656676789 is about 25625.7056293090. The cubic root of 656676789 is about 869.1950051517.

The spelling of 656676789 in words is "six hundred fifty-six million, six hundred seventy-six thousand, seven hundred eighty-nine".