164739665 has 8 divisors (see below), whose sum is σ = 202285248. Its totient is φ = 128726640.

The previous prime is 164739527. The next prime is 164739683. The reversal of 164739665 is 566937461.

164739665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164739665 - 2²⁴ = 147962449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382901 + ... + 383330.

It is an arithmetic number, because the mean of its divisors is an integer number (25285656).

Almost surely, 2^164739665 is an apocalyptic number.

It is an amenable number.

164739665 is a deficient number, since it is larger than the sum of its proper divisors (37545583).

164739665 is an equidigital number, since it uses as much as digits as its factorization.

164739665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766279.

The product of its digits is 816480, while the sum is 47.

The square root of 164739665 is about 12835.0950522386. The cubic root of 164739665 is about 548.1920413563.

It can be divided in two parts, 1647396 and 65, that added together give a palindrome (1647461).

The spelling of 164739665 in words is "one hundred sixty-four million, seven hundred thirty-nine thousand, six hundred sixty-five".