65161791 has 12 divisors (see below), whose sum is σ = 94235232. Its totient is φ = 43389216.

The previous prime is 65161777. The next prime is 65161801. The reversal of 65161791 is 19716156.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-65161791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65162791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4570 + ... + 12296.

It is an arithmetic number, because the mean of its divisors is an integer number (7852936).

Almost surely, 2^65161791 is an apocalyptic number.

65161791 is a deficient number, since it is larger than the sum of its proper divisors (29073441).

65161791 is a wasteful number, since it uses less digits than its factorization.

65161791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8670 (or 8667 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 65161791 is about 8072.2853641333. The cubic root of 65161791 is about 402.4058980404.

The spelling of 65161791 in words is "sixty-five million, one hundred sixty-one thousand, seven hundred ninety-one".