65165561 has 8 divisors (see below), whose sum is σ = 65672160. Its totient is φ = 64661472.

The previous prime is 65165549. The next prime is 65165579. The reversal of 65165561 is 16556156.

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 65165561 - 2²² = 60971257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65165521) 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, 115466 + ... + 116028.

It is an arithmetic number, because the mean of its divisors is an integer number (8209020).

Almost surely, 2^65165561 is an apocalyptic number.

It is an amenable number.

65165561 is a deficient number, since it is larger than the sum of its proper divisors (506599).

65165561 is a wasteful number, since it uses less digits than its factorization.

65165561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255.

The product of its digits is 27000, while the sum is 35.

The square root of 65165561 is about 8072.5188757909. The cubic root of 65165561 is about 402.4136584214.

The spelling of 65165561 in words is "sixty-five million, one hundred sixty-five thousand, five hundred sixty-one".