165864894 has 32 divisors (see below), whose sum is σ = 358268064. Its totient is φ = 50889600.

The previous prime is 165864887. The next prime is 165864913. The reversal of 165864894 is 498468561.

It is a super-2 number, since 2×165864894² = 55022326123262472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26244 + ... + 31944.

It is an arithmetic number, because the mean of its divisors is an integer number (11195877).

Almost surely, 2^165864894 is an apocalyptic number.

165864894 is an abundant number, since it is smaller than the sum of its proper divisors (192403170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165864894 is a wasteful number, since it uses less digits than its factorization.

165864894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092.

The product of its digits is 1658880, while the sum is 51.

The square root of 165864894 is about 12878.8545298097. The cubic root of 165864894 is about 549.4373242772.

The spelling of 165864894 in words is "one hundred sixty-five million, eight hundred sixty-four thousand, eight hundred ninety-four".