668544907 has 8 divisors (see below), whose sum is σ = 708688656. Its totient is φ = 628492032.

The previous prime is 668544883. The next prime is 668544923. The reversal of 668544907 is 709445866.

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 668544907 - 2²⁷ = 534327179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668544407) 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, 7258 + ... + 37279.

It is an arithmetic number, because the mean of its divisors is an integer number (88586082).

Almost surely, 2^668544907 is an apocalyptic number.

668544907 is a deficient number, since it is larger than the sum of its proper divisors (40143749).

668544907 is a wasteful number, since it uses less digits than its factorization.

668544907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45437.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 668544907 is about 25856.2353601602. The cubic root of 668544907 is about 874.4000925202.

The spelling of 668544907 in words is "six hundred sixty-eight million, five hundred forty-four thousand, nine hundred seven".