165186945 has 80 divisors (see below), whose sum is σ = 369249408. Its totient is φ = 68636160.

The previous prime is 165186919. The next prime is 165186997. The reversal of 165186945 is 549681561.

It is not a de Polignac number, because 165186945 - 2¹⁰ = 165185921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165186945.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 28537 + ... + 33833.

Almost surely, 2^165186945 is an apocalyptic number.

165186945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165186945 is an abundant number, since it is smaller than the sum of its proper divisors (204062463).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165186945 is a wasteful number, since it uses less digits than its factorization.

165186945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332 (or 5323 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 165186945 is about 12852.5073429273. The cubic root of 165186945 is about 548.6877199223.

The spelling of 165186945 in words is "one hundred sixty-five million, one hundred eighty-six thousand, nine hundred forty-five".