668272379 has 4 divisors (see below), whose sum is σ = 670198584. Its totient is φ = 666346176.

The previous prime is 668272373. The next prime is 668272391. The reversal of 668272379 is 973272866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 973272866 = 2 ⋅486636433.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668272379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668272373) 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, 962582 + ... + 963275.

It is an arithmetic number, because the mean of its divisors is an integer number (167549646).

Almost surely, 2^668272379 is an apocalyptic number.

668272379 is a deficient number, since it is larger than the sum of its proper divisors (1926205).

668272379 is a wasteful number, since it uses less digits than its factorization.

668272379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926204.

The product of its digits is 1524096, while the sum is 50.

The square root of 668272379 is about 25850.9647595597. The cubic root of 668272379 is about 874.2812618610.

The spelling of 668272379 in words is "six hundred sixty-eight million, two hundred seventy-two thousand, three hundred seventy-nine".