668577266 has 12 divisors (see below), whose sum is σ = 1166599278. Its totient is φ = 286533072.

The previous prime is 668577211. The next prime is 668577307. The reversal of 668577266 is 662775866.

It can be written as a sum of positive squares in only one way, i.e., 430770025 + 237807241 = 20755^2 + 15421^2 .

It is a super-2 number, since 2×668577266² = 893991121224069512, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 3411011 + ... + 3411206.

Almost surely, 2^668577266 is an apocalyptic number.

668577266 is a deficient number, since it is larger than the sum of its proper divisors (498022012).

668577266 is a wasteful number, since it uses less digits than its factorization.

668577266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6822233 (or 6822226 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 53.

The square root of 668577266 is about 25856.8611010695. The cubic root of 668577266 is about 874.4141999027.

The spelling of 668577266 in words is "six hundred sixty-eight million, five hundred seventy-seven thousand, two hundred sixty-six".