669869656 has 8 divisors (see below), whose sum is σ = 1256005620. Its totient is φ = 334934824.

The previous prime is 669869653. The next prime is 669869671. The reversal of 669869656 is 656968966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 669869594 and 669869603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669869653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41866846 + ... + 41866861.

Almost surely, 2^669869656 is an apocalyptic number.

It is an amenable number.

669869656 is a deficient number, since it is larger than the sum of its proper divisors (586135964).

669869656 is a wasteful number, since it uses less digits than its factorization.

669869656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83733713 (or 83733709 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 61.

The square root of 669869656 is about 25881.8402746018. The cubic root of 669869656 is about 874.9772646065.

The spelling of 669869656 in words is "six hundred sixty-nine million, eight hundred sixty-nine thousand, six hundred fifty-six".