165816965 has 8 divisors (see below), whose sum is σ = 199237920. Its totient is φ = 132481872.

The previous prime is 165816947. The next prime is 165816967. The reversal of 165816965 is 569618561.

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 165816965 - 2⁸ = 165816709 is a prime.

It is a super-2 number, since 2×165816965² = 54990531763622450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165816967) 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, 17135 + ... + 25004.

It is an arithmetic number, because the mean of its divisors is an integer number (24904740).

Almost surely, 2^165816965 is an apocalyptic number.

It is an amenable number.

165816965 is a deficient number, since it is larger than the sum of its proper divisors (33420955).

165816965 is an equidigital number, since it uses as much as digits as its factorization.

165816965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42931.

The product of its digits is 388800, while the sum is 47.

The square root of 165816965 is about 12876.9936320556. The cubic root of 165816965 is about 549.3843966247.

The spelling of 165816965 in words is "one hundred sixty-five million, eight hundred sixteen thousand, nine hundred sixty-five".