165145660165503 has 24 divisors (see below), whose sum is σ = 238927313753856. Its totient is φ = 109920170437200.

The previous prime is 165145660165459. The next prime is 165145660165513. The reversal of 165145660165503 is 305561066541561.

165145660165503 is a `hidden beast` number, since 1 + 6 + 5 + 14 + 5 + 6 + 60 + 1 + 65 + 503 = 666.

It is not a de Polignac number, because 165145660165503 - 2¹² = 165145660161407 is a prime.

It is a super-2 number, since 2×165145660165503² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165145660165503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165145660165513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15260176 + ... + 23731082.

It is an arithmetic number, because the mean of its divisors is an integer number (9955304739744).

Almost surely, 2^{165145660165503} is an apocalyptic number.

165145660165503 is a deficient number, since it is larger than the sum of its proper divisors (73781653588353).

165145660165503 is a wasteful number, since it uses less digits than its factorization.

165145660165503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8474395 (or 8474392 counting only the distinct ones).

The product of its (nonzero) digits is 9720000, while the sum is 54.

The spelling of 165145660165503 in words is "one hundred sixty-five trillion, one hundred forty-five billion, six hundred sixty million, one hundred sixty-five thousand, five hundred three".