165636394 has 16 divisors (see below), whose sum is σ = 309761856. Its totient is φ = 64533600.

The previous prime is 165636349. The next prime is 165636403. The reversal of 165636394 is 493636561.

165636394 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 165636394.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537627 + ... + 537934.

It is an arithmetic number, because the mean of its divisors is an integer number (19360116).

Almost surely, 2^165636394 is an apocalyptic number.

165636394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

165636394 is a deficient number, since it is larger than the sum of its proper divisors (144125462).

165636394 is a wasteful number, since it uses less digits than its factorization.

165636394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075581.

The product of its digits is 349920, while the sum is 43.

The square root of 165636394 is about 12869.9803418653. The cubic root of 165636394 is about 549.1849017145.

The spelling of 165636394 in words is "one hundred sixty-five million, six hundred thirty-six thousand, three hundred ninety-four".