65165161 has 4 divisors (see below), whose sum is σ = 65183824. Its totient is φ = 65146500.

The previous prime is 65165123. The next prime is 65165173. The reversal of 65165161 is 16156156.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65165161 - 2¹¹ = 65163113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65165761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2355 + ... + 11656.

It is an arithmetic number, because the mean of its divisors is an integer number (16295956).

Almost surely, 2^65165161 is an apocalyptic number.

It is an amenable number.

65165161 is a deficient number, since it is larger than the sum of its proper divisors (18663).

65165161 is a wasteful number, since it uses less digits than its factorization.

65165161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18662.

The product of its digits is 5400, while the sum is 31.

The square root of 65165161 is about 8072.4941003385. The cubic root of 65165161 is about 402.4128350530.

The spelling of 65165161 in words is "sixty-five million, one hundred sixty-five thousand, one hundred sixty-one".