668108669 has 8 divisors (see below), whose sum is σ = 700288512. Its totient is φ = 636189840.

The previous prime is 668108659. The next prime is 668108677. The reversal of 668108669 is 966801866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668108669 is a prime.

It is a super-2 number, since 2×668108669² = 892738387185903122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668108659) 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, 60002 + ... + 70259.

It is an arithmetic number, because the mean of its divisors is an integer number (87536064).

Almost surely, 2^668108669 is an apocalyptic number.

It is an amenable number.

668108669 is a deficient number, since it is larger than the sum of its proper divisors (32179843).

668108669 is a wasteful number, since it uses less digits than its factorization.

668108669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130507.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 668108669 is about 25847.7981460704. The cubic root of 668108669 is about 874.2098636911.

The spelling of 668108669 in words is "six hundred sixty-eight million, one hundred eight thousand, six hundred sixty-nine".