667994013 has 8 divisors (see below), whose sum is σ = 989620800. Its totient is φ = 445329324.

The previous prime is 667994003. The next prime is 667994029. The reversal of 667994013 is 310499766.

It is not a de Polignac number, because 667994013 - 2⁸ = 667993757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667994013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667994003) 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 7 ways as a sum of consecutive naturals, for example, 12370233 + ... + 12370286.

It is an arithmetic number, because the mean of its divisors is an integer number (123702600).

Almost surely, 2^667994013 is an apocalyptic number.

It is an amenable number.

667994013 is a deficient number, since it is larger than the sum of its proper divisors (321626787).

667994013 is a wasteful number, since it uses less digits than its factorization.

667994013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24740528 (or 24740522 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 667994013 is about 25845.5801443883. The cubic root of 667994013 is about 874.1598522957.

The spelling of 667994013 in words is "six hundred sixty-seven million, nine hundred ninety-four thousand, thirteen".