667994558 has 32 divisors (see below), whose sum is σ = 1274745600. Its totient is φ = 260254680.

The previous prime is 667994557. The next prime is 667994581. The reversal of 667994558 is 855499766.

It is a junction number, because it is equal to n+sod(n) for n = 667994497 and 667994506.

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 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, 36716 + ... + 51807.

It is an arithmetic number, because the mean of its divisors is an integer number (39835800).

Almost surely, 2^667994558 is an apocalyptic number.

667994558 is a deficient number, since it is larger than the sum of its proper divisors (606751042).

667994558 is a wasteful number, since it uses less digits than its factorization.

667994558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88557 (or 88543 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 59.

The square root of 667994558 is about 25845.5906877750. The cubic root of 667994558 is about 874.1600900308.

The spelling of 667994558 in words is "six hundred sixty-seven million, nine hundred ninety-four thousand, five hundred fifty-eight".