667813679 has 16 divisors (see below), whose sum is σ = 730884000. Its totient is φ = 606496896.

The previous prime is 667813673. The next prime is 667813697. The reversal of 667813679 is 976318766.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667813679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667813679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667813673) 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 15 ways as a sum of consecutive naturals, for example, 209552 + ... + 212714.

It is an arithmetic number, because the mean of its divisors is an integer number (45680250).

Almost surely, 2^667813679 is an apocalyptic number.

667813679 is a deficient number, since it is larger than the sum of its proper divisors (63070321).

667813679 is a wasteful number, since it uses less digits than its factorization.

667813679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3434.

The product of its digits is 2286144, while the sum is 53.

The square root of 667813679 is about 25842.0912272981. The cubic root of 667813679 is about 874.0811814655.

The spelling of 667813679 in words is "six hundred sixty-seven million, eight hundred thirteen thousand, six hundred seventy-nine".