656989656 has 16 divisors (see below), whose sum is σ = 1642474200. Its totient is φ = 218996544.

The previous prime is 656989631. The next prime is 656989661.

656989656 is nontrivially palindromic in base 10.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 656989656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13687261 + ... + 13687308.

Almost surely, 2^656989656 is an apocalyptic number.

It is an amenable number.

656989656 is an abundant number, since it is smaller than the sum of its proper divisors (985484544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656989656 is a wasteful number, since it uses less digits than its factorization.

656989656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27374578 (or 27374574 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 60.

The square root of 656989656 is about 25631.8094562206. The cubic root of 656989656 is about 869.3330229517. Note that the first 3 decimals are identical.

The spelling of 656989656 in words is "six hundred fifty-six million, nine hundred eighty-nine thousand, six hundred fifty-six".