164189471209 has 9 divisors (see below), whose sum is σ = 168308796279. Its totient is φ = 160168641840.

The previous prime is 164189471189. The next prime is 164189471227. The reversal of 164189471209 is 902174981461.

The square root of 164189471209 is 405203.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7911568809 + 156277902400 = 88947^2 + 395320^2 .

It is not a de Polignac number, because 164189471209 - 2⁵ = 164189471177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164189471239) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16608382 + ... + 16618264.

Almost surely, 2^164189471209 is an apocalyptic number.

164189471209 is the 405203-rd square number.

164189471209 is the 202602-nd centered octagonal number.

It is an amenable number.

164189471209 is a deficient number, since it is larger than the sum of its proper divisors (4119325070).

164189471209 is an frugal number, since it uses more digits than its factorization.

164189471209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19848 (or 9924 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 164189471209 in words is "one hundred sixty-four billion, one hundred eighty-nine million, four hundred seventy-one thousand, two hundred nine".