172665664 has 28 divisors (see below), whose sum is σ = 343432384. Its totient is φ = 86131584.

The previous prime is 172665653. The next prime is 172665671. The reversal of 172665664 is 466566271.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 172665664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26719 + ... + 32545.

Almost surely, 2^172665664 is an apocalyptic number.

It is an amenable number.

172665664 is a deficient number, since it is larger than the sum of its proper divisors (170766720).

172665664 is an equidigital number, since it uses as much as digits as its factorization.

172665664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302 (or 6292 counting only the distinct ones).

The product of its digits is 362880, while the sum is 43.

The square root of 172665664 is about 13140.2307437883. The cubic root of 172665664 is about 556.8462863930.

The spelling of 172665664 in words is "one hundred seventy-two million, six hundred sixty-five thousand, six hundred sixty-four".