667381187 has 12 divisors (see below), whose sum is σ = 740703600. Its totient is φ = 600808560.

The previous prime is 667381163. The next prime is 667381207. The reversal of 667381187 is 781183766.

It is not a de Polignac number, because 667381187 - 2¹⁰ = 667380163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667381157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14312 + ... + 39237.

It is an arithmetic number, because the mean of its divisors is an integer number (61725300).

Almost surely, 2^667381187 is an apocalyptic number.

667381187 is a deficient number, since it is larger than the sum of its proper divisors (73322413).

667381187 is a wasteful number, since it uses less digits than its factorization.

667381187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53674 (or 53663 counting only the distinct ones).

The product of its digits is 338688, while the sum is 47.

The square root of 667381187 is about 25833.7218960025. The cubic root of 667381187 is about 873.8924488058.

The spelling of 667381187 in words is "six hundred sixty-seven million, three hundred eighty-one thousand, one hundred eighty-seven".