668944613 has 8 divisors (see below), whose sum is σ = 671533632. Its totient is φ = 666361696.

The previous prime is 668944583. The next prime is 668944621. The reversal of 668944613 is 316449866.

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 668944613 - 2¹⁰ = 668943589 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 (668944693) 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, 361256 + ... + 363102.

It is an arithmetic number, because the mean of its divisors is an integer number (83941704).

Almost surely, 2^668944613 is an apocalyptic number.

It is an amenable number.

668944613 is a deficient number, since it is larger than the sum of its proper divisors (2589019).

668944613 is a wasteful number, since it uses less digits than its factorization.

668944613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051.

The product of its digits is 746496, while the sum is 47.

The square root of 668944613 is about 25863.9635980257. The cubic root of 668944613 is about 874.5743183300.

The spelling of 668944613 in words is "six hundred sixty-eight million, nine hundred forty-four thousand, six hundred thirteen".