669516624 has 80 divisors (see below), whose sum is σ = 2196307840. Its totient is φ = 191289600.

The previous prime is 669516619. The next prime is 669516643. The reversal of 669516624 is 426615966.

669516624 is a `hidden beast` number, since 6 + 6 + 9 + 5 + 16 + 624 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 669516624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107677 + ... + 113724.

It is an arithmetic number, because the mean of its divisors is an integer number (27453848).

Almost surely, 2^669516624 is an apocalyptic number.

It is an amenable number.

669516624 is an abundant number, since it is smaller than the sum of its proper divisors (1526791216).

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

669516624 is a wasteful number, since it uses less digits than its factorization.

669516624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221425 (or 221413 counting only the distinct ones).

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

The square root of 669516624 is about 25875.0193043406. The cubic root of 669516624 is about 874.8235286018.

The spelling of 669516624 in words is "six hundred sixty-nine million, five hundred sixteen thousand, six hundred twenty-four".