165145645765 has 8 divisors (see below), whose sum is σ = 198659312280. Its totient is φ = 131793491712.

The previous prime is 165145645751. The next prime is 165145645771. The reversal of 165145645765 is 567546541561.

It is a happy number.

165145645765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 52414897249 + 112730748516 = 228943^2 + 335754^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165145645765 - 2¹⁵ = 165145612997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40375864 + ... + 40379953.

It is an arithmetic number, because the mean of its divisors is an integer number (24832414035).

Almost surely, 2^165145645765 is an apocalyptic number.

It is an amenable number.

165145645765 is a deficient number, since it is larger than the sum of its proper divisors (33513666515).

165145645765 is an equidigital number, since it uses as much as digits as its factorization.

165145645765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80756231.

The product of its digits is 15120000, while the sum is 55.

The spelling of 165145645765 in words is "one hundred sixty-five billion, one hundred forty-five million, six hundred forty-five thousand, seven hundred sixty-five".