668295679 has 4 divisors (see below), whose sum is σ = 682514784. Its totient is φ = 654076576.

The previous prime is 668295671. The next prime is 668295697. The reversal of 668295679 is 976592866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668295679 - 2³ = 668295671 is a prime.

It is a super-2 number, since 2×668295679² = 893238229140142082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668295671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7109482 + ... + 7109575.

It is an arithmetic number, because the mean of its divisors is an integer number (170628696).

Almost surely, 2^668295679 is an apocalyptic number.

668295679 is a deficient number, since it is larger than the sum of its proper divisors (14219105).

668295679 is a wasteful number, since it uses less digits than its factorization.

668295679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14219104.

The product of its digits is 9797760, while the sum is 58.

The square root of 668295679 is about 25851.4154157949. The cubic root of 668295679 is about 874.2914226464.

The spelling of 668295679 in words is "six hundred sixty-eight million, two hundred ninety-five thousand, six hundred seventy-nine".