164659521 has 16 divisors (see below), whose sum is σ = 236936000. Its totient is φ = 101113920.

The previous prime is 164659493. The next prime is 164659543. The reversal of 164659521 is 125956461.

It is not a de Polignac number, because 164659521 - 2⁵ = 164659489 is a prime.

It is a super-2 number, since 2×164659521² = 54225515711898882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 164659521.

It is not an unprimeable number, because it can be changed into a prime (164651521) 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, 15231 + ... + 23691.

It is an arithmetic number, because the mean of its divisors is an integer number (14808500).

Almost surely, 2^164659521 is an apocalyptic number.

It is an amenable number.

164659521 is a deficient number, since it is larger than the sum of its proper divisors (72276479).

164659521 is a wasteful number, since it uses less digits than its factorization.

164659521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976.

The product of its digits is 64800, while the sum is 39.

The square root of 164659521 is about 12831.9726075144. The cubic root of 164659521 is about 548.1031305094.

The spelling of 164659521 in words is "one hundred sixty-four million, six hundred fifty-nine thousand, five hundred twenty-one".