668506667 has 8 divisors (see below), whose sum is σ = 673541232. Its totient is φ = 663487200.

The previous prime is 668506613. The next prime is 668506669. The reversal of 668506667 is 766605866.

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 668506667 - 2⁶ = 668506603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668506669) 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, 94508 + ... + 101334.

It is an arithmetic number, because the mean of its divisors is an integer number (84192654).

Almost surely, 2^668506667 is an apocalyptic number.

668506667 is a deficient number, since it is larger than the sum of its proper divisors (5034565).

668506667 is a wasteful number, since it uses less digits than its factorization.

668506667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7549.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The square root of 668506667 is about 25855.4958761189. The cubic root of 668506667 is about 874.3834206423.

The spelling of 668506667 in words is "six hundred sixty-eight million, five hundred six thousand, six hundred sixty-seven".