165145661663465 has 64 divisors (see below), whose sum is σ = 231303311769600. Its totient is φ = 113146902187200.

The previous prime is 165145661663393. The next prime is 165145661663473. The reversal of 165145661663465 is 564366166541561.

It is not a de Polignac number, because 165145661663465 - 2²⁰ = 165145660614889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11462869292 + ... + 11462883698.

It is an arithmetic number, because the mean of its divisors is an integer number (3614114246400).

Almost surely, 2^{165145661663465} is an apocalyptic number.

It is an amenable number.

165145661663465 is a deficient number, since it is larger than the sum of its proper divisors (66157650106135).

165145661663465 is a wasteful number, since it uses less digits than its factorization.

165145661663465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19627 (or 19613 counting only the distinct ones).

The product of its digits is 279936000, while the sum is 65.

The spelling of 165145661663465 in words is "one hundred sixty-five trillion, one hundred forty-five billion, six hundred sixty-one million, six hundred sixty-three thousand, four hundred sixty-five".