65990165 has 16 divisors (see below), whose sum is σ = 83652096. Its totient is φ = 49896000.

The previous prime is 65990161. The next prime is 65990213. The reversal of 65990165 is 56109956.

It is not a de Polignac number, because 65990165 - 2² = 65990161 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 (65990161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1715 + ... + 11615.

It is an arithmetic number, because the mean of its divisors is an integer number (5228256).

Almost surely, 2^65990165 is an apocalyptic number.

It is an amenable number.

65990165 is a deficient number, since it is larger than the sum of its proper divisors (17661931).

65990165 is a wasteful number, since it uses less digits than its factorization.

65990165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9980.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 65990165 is about 8123.4330796776. The cubic root of 65990165 is about 404.1039275319.

The spelling of 65990165 in words is "sixty-five million, nine hundred ninety thousand, one hundred sixty-five".