164501665 has 16 divisors (see below), whose sum is σ = 202507776. Its totient is φ = 128232000.

The previous prime is 164501663. The next prime is 164501699. The reversal of 164501665 is 566105461.

It is a happy number.

It is not a de Polignac number, because 164501665 - 2¹ = 164501663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164501665.

It is not an unprimeable number, because it can be changed into a prime (164501663) 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, 37960 + ... + 42070.

It is an arithmetic number, because the mean of its divisors is an integer number (12656736).

Almost surely, 2^164501665 is an apocalyptic number.

It is an amenable number.

164501665 is a deficient number, since it is larger than the sum of its proper divisors (38006111).

164501665 is a wasteful number, since it uses less digits than its factorization.

164501665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 164501665 is about 12825.8202466743. The cubic root of 164501665 is about 547.9279224380.

The spelling of 164501665 in words is "one hundred sixty-four million, five hundred one thousand, six hundred sixty-five".