165816143 has 8 divisors (see below), whose sum is σ = 167373888. Its totient is φ = 164265984.

The previous prime is 165816103. The next prime is 165816187. The reversal of 165816143 is 341618561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165816143 - 2²⁰ = 164767567 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165816103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47930 + ... + 51272.

It is an arithmetic number, because the mean of its divisors is an integer number (20921736).

Almost surely, 2^165816143 is an apocalyptic number.

165816143 is a deficient number, since it is larger than the sum of its proper divisors (1557745).

165816143 is a wasteful number, since it uses less digits than its factorization.

165816143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793.

The product of its digits is 17280, while the sum is 35.

The square root of 165816143 is about 12876.9617146282. The cubic root of 165816143 is about 549.3834888070.

The spelling of 165816143 in words is "one hundred sixty-five million, eight hundred sixteen thousand, one hundred forty-three".