164199968189 has 4 divisors (see below), whose sum is σ = 164287356960. Its totient is φ = 164112579420.

The previous prime is 164199968183. The next prime is 164199968197. The reversal of 164199968189 is 981869991461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981869991461 = 31 ⋅31673225531.

It is a cyclic number.

It is not a de Polignac number, because 164199968189 - 2²⁰ = 164198919613 is a prime.

It is a super-2 number, since 2×164199968189² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164199968183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43691567 + ... + 43695324.

It is an arithmetic number, because the mean of its divisors is an integer number (41071839240).

Almost surely, 2^164199968189 is an apocalyptic number.

It is an amenable number.

164199968189 is a deficient number, since it is larger than the sum of its proper divisors (87388771).

164199968189 is an equidigital number, since it uses as much as digits as its factorization.

164199968189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87388770.

The product of its digits is 60466176, while the sum is 71.

The spelling of 164199968189 in words is "one hundred sixty-four billion, one hundred ninety-nine million, nine hundred sixty-eight thousand, one hundred eighty-nine".