668867407 has 8 divisors (see below), whose sum is σ = 725155200. Its totient is φ = 613270560.

The previous prime is 668867401. The next prime is 668867411. The reversal of 668867407 is 704768866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668867407 - 2¹⁹ = 668343119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668867401) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 170719 + ... + 174592.

It is an arithmetic number, because the mean of its divisors is an integer number (90644400).

Almost surely, 2^668867407 is an apocalyptic number.

668867407 is a deficient number, since it is larger than the sum of its proper divisors (56287793).

668867407 is a wasteful number, since it uses less digits than its factorization.

668867407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345473.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The square root of 668867407 is about 25862.4710149668. The cubic root of 668867407 is about 874.5406708096.

The spelling of 668867407 in words is "six hundred sixty-eight million, eight hundred sixty-seven thousand, four hundred seven".