165544081 has 8 divisors (see below), whose sum is σ = 167791680. Its totient is φ = 163302672.

The previous prime is 165544051. The next prime is 165544091. The reversal of 165544081 is 180445561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165544081 - 2⁷ = 165543953 is a prime.

It is a super-2 number, since 2×165544081² = 54809685508269122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165544021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80575 + ... + 82603.

It is an arithmetic number, because the mean of its divisors is an integer number (20973960).

Almost surely, 2^165544081 is an apocalyptic number.

It is an amenable number.

165544081 is a deficient number, since it is larger than the sum of its proper divisors (2247599).

165544081 is an equidigital number, since it uses as much as digits as its factorization.

165544081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3095.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 165544081 is about 12866.3934729201. The cubic root of 165544081 is about 549.0828582652.

The spelling of 165544081 in words is "one hundred sixty-five million, five hundred forty-four thousand, eighty-one".