669005568 has 360 divisors, whose sum is σ = 2493025920. Its totient is φ = 173352960.

The previous prime is 669005551. The next prime is 669005609. The reversal of 669005568 is 865500966.

669005568 is a `hidden beast` number, since 6 + 6 + 90 + 0 + 556 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1596463 + ... + 1596881.

It is an arithmetic number, because the mean of its divisors is an integer number (6925072).

Almost surely, 2^669005568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669005568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1246512960).

669005568 is an abundant number, since it is smaller than the sum of its proper divisors (1824020352).

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

669005568 is a wasteful number, since it uses less digits than its factorization.

669005568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 669005568 is about 25865.1419481897. The cubic root of 669005568 is about 874.6008815947.

The spelling of 669005568 in words is "six hundred sixty-nine million, five thousand, five hundred sixty-eight".