164118561 has 16 divisors (see below), whose sum is σ = 243892800. Its totient is φ = 97555968.

The previous prime is 164118553. The next prime is 164118571. The reversal of 164118561 is 165811461.

It is not a de Polignac number, because 164118561 - 2³ = 164118553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164118541) 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, 83716 + ... + 85653.

It is an arithmetic number, because the mean of its divisors is an integer number (15243300).

Almost surely, 2^164118561 is an apocalyptic number.

It is an amenable number.

164118561 is a deficient number, since it is larger than the sum of its proper divisors (79774239).

164118561 is a wasteful number, since it uses less digits than its factorization.

164118561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169408.

The product of its digits is 5760, while the sum is 33.

The square root of 164118561 is about 12810.8766678944. The cubic root of 164118561 is about 547.5022397273.

It can be divided in two parts, 1641 and 18561, that added together give a palindrome (20202).

The spelling of 164118561 in words is "one hundred sixty-four million, one hundred eighteen thousand, five hundred sixty-one".