165816343 has 18 divisors (see below), whose sum is σ = 212025408. Its totient is φ = 129202920.

The previous prime is 165816337. The next prime is 165816367. The reversal of 165816343 is 343618561.

It is not a de Polignac number, because 165816343 - 2¹⁷ = 165685271 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165813343) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8055 + ... + 19912.

Almost surely, 2^165816343 is an apocalyptic number.

165816343 is a deficient number, since it is larger than the sum of its proper divisors (46209065).

165816343 is a wasteful number, since it uses less digits than its factorization.

165816343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28003 (or 27985 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 165816343 is about 12876.9694804329. The cubic root of 165816343 is about 549.3837096875.

The spelling of 165816343 in words is "one hundred sixty-five million, eight hundred sixteen thousand, three hundred forty-three".