168165385 has 4 divisors (see below), whose sum is σ = 201798468. Its totient is φ = 134532304.

The previous prime is 168165383. The next prime is 168165391. The reversal of 168165385 is 583561861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29019769 + 139145616 = 5387^2 + 11796^2 .

It is a cyclic number.

It is not a de Polignac number, because 168165385 - 2¹ = 168165383 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16816534 + ... + 16816543.

It is an arithmetic number, because the mean of its divisors is an integer number (50449617).

Almost surely, 2^168165385 is an apocalyptic number.

It is an amenable number.

168165385 is a deficient number, since it is larger than the sum of its proper divisors (33633083).

168165385 is an equidigital number, since it uses as much as digits as its factorization.

168165385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33633082.

The product of its digits is 172800, while the sum is 43.

The square root of 168165385 is about 12967.8596923317. The cubic root of 168165385 is about 551.9658412402.

It can be divided in two parts, 16816 and 5385, that added together give a square (22201 = 149²).

The spelling of 168165385 in words is "one hundred sixty-eight million, one hundred sixty-five thousand, three hundred eighty-five".