668079959 has 4 divisors (see below), whose sum is σ = 668138304. Its totient is φ = 668021616.

The previous prime is 668079943. The next prime is 668079961. The reversal of 668079959 is 959970866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 668079959 - 2⁴ = 668079943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668079898 and 668079907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668079059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5702 + ... + 36995.

It is an arithmetic number, because the mean of its divisors is an integer number (167034576).

Almost surely, 2^668079959 is an apocalyptic number.

668079959 is a deficient number, since it is larger than the sum of its proper divisors (58345).

668079959 is a wasteful number, since it uses less digits than its factorization.

668079959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58344.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The square root of 668079959 is about 25847.2427736500. The cubic root of 668079959 is about 874.1973413147.

The spelling of 668079959 in words is "six hundred sixty-eight million, seventy-nine thousand, nine hundred fifty-nine".