165664143 has 16 divisors (see below), whose sum is σ = 250652160. Its totient is φ = 108092088.

The previous prime is 165664127. The next prime is 165664159. The reversal of 165664143 is 341466561.

It is a happy number.

165664143 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 641 + 4 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (165664127) and next prime (165664159).

It is not a de Polignac number, because 165664143 - 2⁴ = 165664127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165664098 and 165664107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165664183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64005 + ... + 66542.

It is an arithmetic number, because the mean of its divisors is an integer number (15665760).

Almost surely, 2^165664143 is an apocalyptic number.

165664143 is a deficient number, since it is larger than the sum of its proper divisors (84988017).

165664143 is a wasteful number, since it uses less digits than its factorization.

165664143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130603 (or 130597 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 165664143 is about 12871.0583480924. The cubic root of 165664143 is about 549.2155682457.

The spelling of 165664143 in words is "one hundred sixty-five million, six hundred sixty-four thousand, one hundred forty-three".