667208165 has 16 divisors (see below), whose sum is σ = 863014656. Its totient is φ = 492264000.

The previous prime is 667208159. The next prime is 667208189. The reversal of 667208165 is 561802766.

It is not a de Polignac number, because 667208165 - 2²⁶ = 600099301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79940 + ... + 87890.

It is an arithmetic number, because the mean of its divisors is an integer number (53938416).

Almost surely, 2^667208165 is an apocalyptic number.

667208165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

667208165 is a deficient number, since it is larger than the sum of its proper divisors (195806491).

667208165 is a wasteful number, since it uses less digits than its factorization.

667208165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9260.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 667208165 is about 25830.3729163944. The cubic root of 667208165 is about 873.8169219101.

The spelling of 667208165 in words is "six hundred sixty-seven million, two hundred eight thousand, one hundred sixty-five".