164556204121 has 16 divisors (see below), whose sum is σ = 176654065104. Its totient is φ = 152727773184.

The previous prime is 164556204097. The next prime is 164556204139. The reversal of 164556204121 is 121402655461.

It can be written as a sum of positive squares in 8 ways, for example, as 74046025 + 164482158096 = 8605^2 + 405564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164556204121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164556204221) 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, 11699325 + ... + 11713381.

It is an arithmetic number, because the mean of its divisors is an integer number (11040879069).

Almost surely, 2^164556204121 is an apocalyptic number.

It is an amenable number.

164556204121 is a deficient number, since it is larger than the sum of its proper divisors (12097860983).

164556204121 is a wasteful number, since it uses less digits than its factorization.

164556204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23580.

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 164556204121 its reverse (121402655461), we get a palindrome (285958859582).

The spelling of 164556204121 in words is "one hundred sixty-four billion, five hundred fifty-six million, two hundred four thousand, one hundred twenty-one".