168165389 has 16 divisors (see below), whose sum is σ = 200859648. Its totient is φ = 137782512.

The previous prime is 168165383. The next prime is 168165391. The reversal of 168165389 is 983561861.

It is a de Polignac number, because none of the positive numbers 2^k-168165389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168165383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8204 + ... + 20090.

It is an arithmetic number, because the mean of its divisors is an integer number (12553728).

Almost surely, 2^168165389 is an apocalyptic number.

It is an amenable number.

168165389 is a deficient number, since it is larger than the sum of its proper divisors (32694259).

168165389 is a wasteful number, since it uses less digits than its factorization.

168165389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11984.

The product of its digits is 311040, while the sum is 47.

The square root of 168165389 is about 12967.8598465591. The cubic root of 168165389 is about 551.9658456166.

The spelling of 168165389 in words is "one hundred sixty-eight million, one hundred sixty-five thousand, three hundred eighty-nine".