668456187 has 24 divisors (see below), whose sum is σ = 1049299776. Its totient is φ = 377365968.

The previous prime is 668456149. The next prime is 668456203. The reversal of 668456187 is 781654866.

It is not a de Polignac number, because 668456187 - 2¹⁰ = 668455163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668456147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15193 + ... + 39594.

It is an arithmetic number, because the mean of its divisors is an integer number (43720824).

Almost surely, 2^668456187 is an apocalyptic number.

668456187 is a deficient number, since it is larger than the sum of its proper divisors (380843589).

668456187 is a wasteful number, since it uses less digits than its factorization.

668456187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54887 (or 54880 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 668456187 is about 25854.5196629139. The cubic root of 668456187 is about 874.3614113948.

The spelling of 668456187 in words is "six hundred sixty-eight million, four hundred fifty-six thousand, one hundred eighty-seven".