668149902 has 48 divisors (see below), whose sum is σ = 1677791232. Its totient is φ = 188208720.

The previous prime is 668149873. The next prime is 668149919. The reversal of 668149902 is 209941866.

It is a happy number.

668149902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28398 + ... + 46289.

It is an arithmetic number, because the mean of its divisors is an integer number (34953984).

Almost surely, 2^668149902 is an apocalyptic number.

668149902 is an abundant number, since it is smaller than the sum of its proper divisors (1009641330).

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

668149902 is a wasteful number, since it uses less digits than its factorization.

668149902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74773 (or 74770 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 668149902 is about 25848.5957452238. The cubic root of 668149902 is about 874.2278475688.

The spelling of 668149902 in words is "six hundred sixty-eight million, one hundred forty-nine thousand, nine hundred two".