667706165 has 16 divisors (see below), whose sum is σ = 919522560. Its totient is φ = 455950080.

The previous prime is 667706159. The next prime is 667706167. The reversal of 667706165 is 561607766.

It is a de Polignac number, because none of the positive numbers 2^k-667706165 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667706167) 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, 31145 + ... + 48014.

It is an arithmetic number, because the mean of its divisors is an integer number (57470160).

Almost surely, 2^667706165 is an apocalyptic number.

It is an amenable number.

667706165 is a deficient number, since it is larger than the sum of its proper divisors (251816395).

667706165 is a wasteful number, since it uses less digits than its factorization.

667706165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79412.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 667706165 is about 25840.0109326602. The cubic root of 667706165 is about 874.0342716707.

The spelling of 667706165 in words is "six hundred sixty-seven million, seven hundred six thousand, one hundred sixty-five".