65161265131 has 4 divisors (see below), whose sum is σ = 65328775200. Its totient is φ = 64993755064.

The previous prime is 65161265129. The next prime is 65161265167. The reversal of 65161265131 is 13156216156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65161265131 - 2¹ = 65161265129 is a prime.

It is a super-2 number, since 2×65161265131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65161265531) 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, 83754451 + ... + 83755228.

It is an arithmetic number, because the mean of its divisors is an integer number (16332193800).

Almost surely, 2^65161265131 is an apocalyptic number.

65161265131 is a deficient number, since it is larger than the sum of its proper divisors (167510069).

65161265131 is a wasteful number, since it uses less digits than its factorization.

65161265131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167510068.

The product of its digits is 32400, while the sum is 37.

The spelling of 65161265131 in words is "sixty-five billion, one hundred sixty-one million, two hundred sixty-five thousand, one hundred thirty-one".