165912345 has 12 divisors (see below), whose sum is σ = 287581476. Its totient is φ = 88486560.

The previous prime is 165912323. The next prime is 165912349. The reversal of 165912345 is 543219561.

165912345 is a `hidden beast` number, since 1 + 6 + 591 + 23 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 41835024 + 124077321 = 6468^2 + 11139^2 .

It is not a de Polignac number, because 165912345 - 2¹⁰ = 165911321 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (165912349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1843426 + ... + 1843515.

It is an arithmetic number, because the mean of its divisors is an integer number (23965123).

Almost surely, 2^165912345 is an apocalyptic number.

165912345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165912345 is a deficient number, since it is larger than the sum of its proper divisors (121669131).

165912345 is a wasteful number, since it uses less digits than its factorization.

165912345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686952 (or 3686949 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 165912345 is about 12880.6966038332. The cubic root of 165912345 is about 549.4897140347.

The spelling of 165912345 in words is "one hundred sixty-five million, nine hundred twelve thousand, three hundred forty-five".