165994801 has 12 divisors (see below), whose sum is σ = 199326720. Its totient is φ = 137690280.

The previous prime is 165994757. The next prime is 165994837. The reversal of 165994801 is 108499561.

It is not a de Polignac number, because 165994801 - 2¹⁷ = 165863729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165994201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53121 + ... + 56158.

It is an arithmetic number, because the mean of its divisors is an integer number (16610560).

Almost surely, 2^165994801 is an apocalyptic number.

It is an amenable number.

165994801 is a deficient number, since it is larger than the sum of its proper divisors (33331919).

165994801 is a wasteful number, since it uses less digits than its factorization.

165994801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109324 (or 109317 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 165994801 is about 12883.8969648162. The cubic root of 165994801 is about 549.5807283993.

The spelling of 165994801 in words is "one hundred sixty-five million, nine hundred ninety-four thousand, eight hundred one".