668532516 has 24 divisors (see below), whose sum is σ = 1560377280. Its totient is φ = 222777312.

The previous prime is 668532503. The next prime is 668532551. The reversal of 668532516 is 615235866.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49105 + ... + 61223.

It is an arithmetic number, because the mean of its divisors is an integer number (65015720).

Almost surely, 2^668532516 is an apocalyptic number.

It is an amenable number.

668532516 is an abundant number, since it is smaller than the sum of its proper divisors (891844764).

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

668532516 is a wasteful number, since it uses less digits than its factorization.

668532516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16723 (or 16721 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 668532516 is about 25855.9957456680. The cubic root of 668532516 is about 874.3946903608.

The spelling of 668532516 in words is "six hundred sixty-eight million, five hundred thirty-two thousand, five hundred sixteen".