668945602 has 12 divisors (see below), whose sum is σ = 1086542370. Its totient is φ = 308743968.

The previous prime is 668945573. The next prime is 668945617. The reversal of 668945602 is 206549866.

It can be written as a sum of positive squares in 3 ways, for example, as 157778721 + 511166881 = 12561^2 + 22609^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 989227 + ... + 989902.

Almost surely, 2^668945602 is an apocalyptic number.

668945602 is a deficient number, since it is larger than the sum of its proper divisors (417596768).

668945602 is a wasteful number, since it uses less digits than its factorization.

668945602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1979157 (or 1979144 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 668945602 is about 25863.9827172847. The cubic root of 668945602 is about 874.5747493341.

The spelling of 668945602 in words is "six hundred sixty-eight million, nine hundred forty-five thousand, six hundred two".