667117899 has 36 divisors (see below), whose sum is σ = 1139361600. Its totient is φ = 374945760.

The previous prime is 667117889. The next prime is 667117903. The reversal of 667117899 is 998711766.

It is not a de Polignac number, because 667117899 - 2⁴ = 667117883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667117889) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14502 + ... + 39300.

Almost surely, 2^667117899 is an apocalyptic number.

667117899 is a deficient number, since it is larger than the sum of its proper divisors (472243701).

667117899 is a wasteful number, since it uses less digits than its factorization.

667117899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24880 (or 24870 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 667117899 is about 25828.6255731891. The cubic root of 667117899 is about 873.7775141612. Note that the first 3 decimals are identical.

The spelling of 667117899 in words is "six hundred sixty-seven million, one hundred seventeen thousand, eight hundred ninety-nine".