668305667 has 8 divisors (see below), whose sum is σ = 692429040. Its totient is φ = 644254240.

The previous prime is 668305633. The next prime is 668305679. The reversal of 668305667 is 766503866.

It is a happy number.

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 668305667 - 2¹⁰ = 668304643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668305607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1292 + ... + 36582.

It is an arithmetic number, because the mean of its divisors is an integer number (86553630).

Almost surely, 2^668305667 is an apocalyptic number.

668305667 is a deficient number, since it is larger than the sum of its proper divisors (24123373).

668305667 is a wasteful number, since it uses less digits than its factorization.

668305667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35973.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 668305667 is about 25851.6085959849. The cubic root of 668305667 is about 874.2957781931.

The spelling of 668305667 in words is "six hundred sixty-eight million, three hundred five thousand, six hundred sixty-seven".