668472679 has 4 divisors (see below), whose sum is σ = 763968784. Its totient is φ = 572976576.

The previous prime is 668472661. The next prime is 668472683. The reversal of 668472679 is 976274866.

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 668472679 - 2⁵ = 668472647 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 (668472659) 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, 47748042 + ... + 47748055.

It is an arithmetic number, because the mean of its divisors is an integer number (190992196).

Almost surely, 2^668472679 is an apocalyptic number.

668472679 is a deficient number, since it is larger than the sum of its proper divisors (95496105).

668472679 is an equidigital number, since it uses as much as digits as its factorization.

668472679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95496104.

The product of its digits is 6096384, while the sum is 55.

The square root of 668472679 is about 25854.8385993802. The cubic root of 668472679 is about 874.3686020181.

The spelling of 668472679 in words is "six hundred sixty-eight million, four hundred seventy-two thousand, six hundred seventy-nine".