165444712139 has 4 divisors (see below), whose sum is σ = 189079671024. Its totient is φ = 141809753256.

The previous prime is 165444712129. The next prime is 165444712171. The reversal of 165444712139 is 931217444561.

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 165444712139 - 2³² = 161149744843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165444712093 and 165444712102.

It is not an unprimeable number, because it can be changed into a prime (165444712129) 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, 11817479432 + ... + 11817479445.

It is an arithmetic number, because the mean of its divisors is an integer number (47269917756).

Almost surely, 2^165444712139 is an apocalyptic number.

165444712139 is a deficient number, since it is larger than the sum of its proper divisors (23634958885).

165444712139 is an equidigital number, since it uses as much as digits as its factorization.

165444712139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23634958884.

The product of its digits is 725760, while the sum is 47.

The spelling of 165444712139 in words is "one hundred sixty-five billion, four hundred forty-four million, seven hundred twelve thousand, one hundred thirty-nine".