669214656 has 448 divisors, whose sum is σ = 2414016000. Its totient is φ = 179159040.

The previous prime is 669214631. The next prime is 669214661. The reversal of 669214656 is 656412966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6139530 + ... + 6139638.

Almost surely, 2^669214656 is an apocalyptic number.

669214656 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669214656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207008000).

669214656 is an abundant number, since it is smaller than the sum of its proper divisors (1744801344).

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

669214656 is a wasteful number, since it uses less digits than its factorization.

669214656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 161 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 669214656 is about 25869.1835201655. The cubic root of 669214656 is about 874.6919867166.

The spelling of 669214656 in words is "six hundred sixty-nine million, two hundred fourteen thousand, six hundred fifty-six".