165145665407 has 4 divisors (see below), whose sum is σ = 165242300040. Its totient is φ = 165049030776.

The previous prime is 165145665343. The next prime is 165145665409. The reversal of 165145665407 is 704566541561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 704566541561 = 19069 ⋅36948269.

It is a cyclic number.

It is not a de Polignac number, because 165145665407 - 2⁶ = 165145665343 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 (165145665409) 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, 48314753 + ... + 48318170.

It is an arithmetic number, because the mean of its divisors is an integer number (41310575010).

Almost surely, 2^165145665407 is an apocalyptic number.

165145665407 is a deficient number, since it is larger than the sum of its proper divisors (96634633).

165145665407 is an equidigital number, since it uses as much as digits as its factorization.

165145665407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96634632.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 165145665407 in words is "one hundred sixty-five billion, one hundred forty-five million, six hundred sixty-five thousand, four hundred seven".