667946579 has 4 divisors (see below), whose sum is σ = 670053984. Its totient is φ = 665839176.

The previous prime is 667946561. The next prime is 667946581. The reversal of 667946579 is 975649766.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667946579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667946549) 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, 1053227 + ... + 1053860.

It is an arithmetic number, because the mean of its divisors is an integer number (167513496).

Almost surely, 2^667946579 is an apocalyptic number.

667946579 is a deficient number, since it is larger than the sum of its proper divisors (2107405).

667946579 is a wasteful number, since it uses less digits than its factorization.

667946579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107404.

The product of its digits is 17146080, while the sum is 59.

The square root of 667946579 is about 25844.6624857049. The cubic root of 667946579 is about 874.1391605533.

The spelling of 667946579 in words is "six hundred sixty-seven million, nine hundred forty-six thousand, five hundred seventy-nine".