165725680135 has 4 divisors (see below), whose sum is σ = 198870816168. Its totient is φ = 132580544104.

The previous prime is 165725680129. The next prime is 165725680223. The reversal of 165725680135 is 531086527561.

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 165725680135 - 2²⁹ = 165188809223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16572568009 + ... + 16572568018.

It is an arithmetic number, because the mean of its divisors is an integer number (49717704042).

Almost surely, 2^165725680135 is an apocalyptic number.

165725680135 is a deficient number, since it is larger than the sum of its proper divisors (33145136033).

165725680135 is an equidigital number, since it uses as much as digits as its factorization.

165725680135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33145136032.

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 165725680135 in words is "one hundred sixty-five billion, seven hundred twenty-five million, six hundred eighty thousand, one hundred thirty-five".