165507081 has 8 divisors (see below), whose sum is σ = 232290720. Its totient is φ = 104530752.

The previous prime is 165507073. The next prime is 165507107. The reversal of 165507081 is 180705561.

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

It is not a de Polignac number, because 165507081 - 2³ = 165507073 is a prime.

It is a super-2 number, since 2×165507081² = 54785187722281122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165507061) 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 7 ways as a sum of consecutive naturals, for example, 1451760 + ... + 1451873.

It is an arithmetic number, because the mean of its divisors is an integer number (29036340).

Almost surely, 2^165507081 is an apocalyptic number.

It is an amenable number.

165507081 is a deficient number, since it is larger than the sum of its proper divisors (66783639).

165507081 is a wasteful number, since it uses less digits than its factorization.

165507081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903655.

The product of its (nonzero) digits is 8400, while the sum is 33.

The square root of 165507081 is about 12864.9555382053. The cubic root of 165507081 is about 549.0419475515.

The spelling of 165507081 in words is "one hundred sixty-five million, five hundred seven thousand, eighty-one".