165705081 has 8 divisors (see below), whose sum is σ = 221002080. Its totient is φ = 110439072.

The previous prime is 165705079. The next prime is 165705157. The reversal of 165705081 is 180507561.

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

It is not a de Polignac number, because 165705081 - 2¹ = 165705079 is a prime.

It is a super-2 number, since 2×165705081² = 54916347738433122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165705011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11725 + ... + 21653.

It is an arithmetic number, because the mean of its divisors is an integer number (27625260).

Almost surely, 2^165705081 is an apocalyptic number.

It is an amenable number.

165705081 is a deficient number, since it is larger than the sum of its proper divisors (55296999).

165705081 is an equidigital number, since it uses as much as digits as its factorization.

165705081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15495.

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

The square root of 165705081 is about 12872.6485619705. The cubic root of 165705081 is about 549.2608042168.

The spelling of 165705081 in words is "one hundred sixty-five million, seven hundred five thousand, eighty-one".