165544322505 has 16 divisors (see below), whose sum is σ = 265120114560. Its totient is φ = 88207239168.

The previous prime is 165544322453. The next prime is 165544322513. The reversal of 165544322505 is 505223445561.

It is not a de Polignac number, because 165544322505 - 2⁸ = 165544322249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5175160 + ... + 5207049.

It is an arithmetic number, because the mean of its divisors is an integer number (16570007160).

Almost surely, 2^165544322505 is an apocalyptic number.

165544322505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165544322505 is a deficient number, since it is larger than the sum of its proper divisors (99575792055).

165544322505 is a wasteful number, since it uses less digits than its factorization.

165544322505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10383280.

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 165544322505 in words is "one hundred sixty-five billion, five hundred forty-four million, three hundred twenty-two thousand, five hundred five".