668690154 has 40 divisors (see below), whose sum is σ = 1634580288. Its totient is φ = 202632840.

The previous prime is 668690117. The next prime is 668690171. The reversal of 668690154 is 451096866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185842 + ... + 189405.

Almost surely, 2^668690154 is an apocalyptic number.

668690154 is an abundant number, since it is smaller than the sum of its proper divisors (965890134).

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

668690154 is a wasteful number, since it uses less digits than its factorization.

668690154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375272 (or 375263 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 668690154 is about 25859.0439498447. The cubic root of 668690154 is about 874.4634115246.

The spelling of 668690154 in words is "six hundred sixty-eight million, six hundred ninety thousand, one hundred fifty-four".