668156272 has 40 divisors (see below), whose sum is σ = 1482155136. Its totient is φ = 285836736.

The previous prime is 668156267. The next prime is 668156303. The reversal of 668156272 is 272651866.

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, 60663 + ... + 70825.

Almost surely, 2^668156272 is an apocalyptic number.

It is an amenable number.

668156272 is an abundant number, since it is smaller than the sum of its proper divisors (813998864).

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

668156272 is a wasteful number, since it uses less digits than its factorization.

668156272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765 (or 10759 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 668156272 is about 25848.7189624554. The cubic root of 668156272 is about 874.2306257945.

The spelling of 668156272 in words is "six hundred sixty-eight million, one hundred fifty-six thousand, two hundred seventy-two".