164639985199 has 4 divisors (see below), whose sum is σ = 166895327536. Its totient is φ = 162384642864.

The previous prime is 164639985193. The next prime is 164639985233. The reversal of 164639985199 is 991589936461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164639985199 - 2²⁵ = 164606430767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164639985193) 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, 1127671059 + ... + 1127671204.

It is an arithmetic number, because the mean of its divisors is an integer number (41723831884).

Almost surely, 2^164639985199 is an apocalyptic number.

164639985199 is a deficient number, since it is larger than the sum of its proper divisors (2255342337).

164639985199 is an equidigital number, since it uses as much as digits as its factorization.

164639985199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255342336.

The product of its digits is 113374080, while the sum is 70.

The spelling of 164639985199 in words is "one hundred sixty-four billion, six hundred thirty-nine million, nine hundred eighty-five thousand, one hundred ninety-nine".