668445297 has 16 divisors (see below), whose sum is σ = 1001551488. Its totient is φ = 393465600.

The previous prime is 668445223. The next prime is 668445319. The reversal of 668445297 is 792544866.

It is not a de Polignac number, because 668445297 - 2¹¹ = 668443249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668444297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371704 + ... + 373497.

It is an arithmetic number, because the mean of its divisors is an integer number (62596968).

Almost surely, 2^668445297 is an apocalyptic number.

It is an amenable number.

668445297 is a deficient number, since it is larger than the sum of its proper divisors (333106191).

668445297 is a wasteful number, since it uses less digits than its factorization.

668445297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745240.

The product of its digits is 2903040, while the sum is 51.

The square root of 668445297 is about 25854.3090605802. The cubic root of 668445297 is about 874.3566632165.

The spelling of 668445297 in words is "six hundred sixty-eight million, four hundred forty-five thousand, two hundred ninety-seven".