669900656 has 20 divisors (see below), whose sum is σ = 1298745000. Its totient is φ = 334740672.

The previous prime is 669900643. The next prime is 669900659. The reversal of 669900656 is 656009966.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 669900656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669900659) 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, 15095 + ... + 39593.

It is an arithmetic number, because the mean of its divisors is an integer number (64937250).

Almost surely, 2^669900656 is an apocalyptic number.

It is an amenable number.

669900656 is a deficient number, since it is larger than the sum of its proper divisors (628844344).

669900656 is a wasteful number, since it uses less digits than its factorization.

669900656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26216 (or 26210 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 669900656 is about 25882.4391431720. The cubic root of 669900656 is about 874.9907616984.

The spelling of 669900656 in words is "six hundred sixty-nine million, nine hundred thousand, six hundred fifty-six".