668790109 has 8 divisors (see below), whose sum is σ = 730380672. Its totient is φ = 608648880.

The previous prime is 668790091. The next prime is 668790121. The reversal of 668790109 is 901097866.

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 668790109 - 2²⁵ = 635235677 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 (668790169) 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, 361369 + ... + 363214.

It is an arithmetic number, because the mean of its divisors is an integer number (91297584).

Almost surely, 2^668790109 is an apocalyptic number.

It is an amenable number.

668790109 is a deficient number, since it is larger than the sum of its proper divisors (61590563).

668790109 is a wasteful number, since it uses less digits than its factorization.

668790109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724667.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 668790109 is about 25860.9765670208. The cubic root of 668790109 is about 874.5069806002.

The spelling of 668790109 in words is "six hundred sixty-eight million, seven hundred ninety thousand, one hundred nine".