668657266 has 16 divisors (see below), whose sum is σ = 1047559680. Its totient is φ = 319777200.

The previous prime is 668657251. The next prime is 668657309. The reversal of 668657266 is 662756866.

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, 72210 + ... + 80941.

It is an arithmetic number, because the mean of its divisors is an integer number (65472480).

Almost surely, 2^668657266 is an apocalyptic number.

668657266 is a deficient number, since it is larger than the sum of its proper divisors (378902414).

668657266 is a wasteful number, since it uses less digits than its factorization.

668657266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153249.

The product of its digits is 4354560, while the sum is 52.

The square root of 668657266 is about 25858.4080329784. The cubic root of 668657266 is about 874.4490751268.

The spelling of 668657266 in words is "six hundred sixty-eight million, six hundred fifty-seven thousand, two hundred sixty-six".