65111161 has 4 divisors (see below), whose sum is σ = 66214800. Its totient is φ = 64007524.

The previous prime is 65111143. The next prime is 65111201. The reversal of 65111161 is 16111156.

65111161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 65111161 - 2¹³ = 65102969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65111261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551731 + ... + 551848.

It is an arithmetic number, because the mean of its divisors is an integer number (16553700).

Almost surely, 2^65111161 is an apocalyptic number.

It is an amenable number.

65111161 is a deficient number, since it is larger than the sum of its proper divisors (1103639).

65111161 is a wasteful number, since it uses less digits than its factorization.

65111161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103638.

The product of its digits is 180, while the sum is 22.

The square root of 65111161 is about 8069.1487159427. The cubic root of 65111161 is about 402.3016493729.

The spelling of 65111161 in words is "sixty-five million, one hundred eleven thousand, one hundred sixty-one".