667994559 has 16 divisors (see below), whose sum is σ = 915480192. Its totient is φ = 432939168.

The previous prime is 667994557. The next prime is 667994581. The reversal of 667994559 is 955499766.

It is not a de Polignac number, because 667994559 - 2¹ = 667994557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667994557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247632 + ... + 250314.

It is an arithmetic number, because the mean of its divisors is an integer number (57217512).

Almost surely, 2^667994559 is an apocalyptic number.

667994559 is a deficient number, since it is larger than the sum of its proper divisors (247485633).

667994559 is a wasteful number, since it uses less digits than its factorization.

667994559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966.

The product of its digits is 18370800, while the sum is 60.

The square root of 667994559 is about 25845.5907071206. The cubic root of 667994559 is about 874.1600904670.

The spelling of 667994559 in words is "six hundred sixty-seven million, nine hundred ninety-four thousand, five hundred fifty-nine".