165539941 has 16 divisors (see below), whose sum is σ = 191641600. Its totient is φ = 140065200.

The previous prime is 165539903. The next prime is 165539953. The reversal of 165539941 is 149935561.

It is a cyclic number.

It is not a de Polignac number, because 165539941 - 2²⁵ = 131985509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165539971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209950 + ... + 210736.

It is an arithmetic number, because the mean of its divisors is an integer number (11977600).

Almost surely, 2^165539941 is an apocalyptic number.

It is an amenable number.

165539941 is a deficient number, since it is larger than the sum of its proper divisors (26101659).

165539941 is a wasteful number, since it uses less digits than its factorization.

165539941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144.

The product of its digits is 145800, while the sum is 43.

The square root of 165539941 is about 12866.2325876692. The cubic root of 165539941 is about 549.0782809909.

The spelling of 165539941 in words is "one hundred sixty-five million, five hundred thirty-nine thousand, nine hundred forty-one".