668517052 has 24 divisors (see below), whose sum is σ = 1407405440. Its totient is φ = 271427760.

The previous prime is 668517041. The next prime is 668517097. The reversal of 668517052 is 250715866.

It is a junction number, because it is equal to n+sod(n) for n = 668516996 and 668517014.

It is a congruent 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, 627774 + ... + 628837.

Almost surely, 2^668517052 is an apocalyptic number.

It is an amenable number.

668517052 is an abundant number, since it is smaller than the sum of its proper divisors (738888388).

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

668517052 is a wasteful number, since it uses less digits than its factorization.

668517052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256641 (or 1256639 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 668517052 is about 25855.6967030479. The cubic root of 668517052 is about 874.3879483582.

The spelling of 668517052 in words is "six hundred sixty-eight million, five hundred seventeen thousand, fifty-two".