65131073281 has 4 divisors (see below), whose sum is σ = 65373196500. Its totient is φ = 64888950064.

The previous prime is 65131073279. The next prime is 65131073311. The reversal of 65131073281 is 18237013156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33504007681 + 31627065600 = 183041^2 + 177840^2 .

It is a cyclic number.

It is not a de Polignac number, because 65131073281 - 2¹ = 65131073279 is a prime.

It is a super-2 number, since 2×65131073281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65131073281.

It is not an unprimeable number, because it can be changed into a prime (65131073221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121061206 + ... + 121061743.

It is an arithmetic number, because the mean of its divisors is an integer number (16343299125).

Almost surely, 2^65131073281 is an apocalyptic number.

It is an amenable number.

65131073281 is a deficient number, since it is larger than the sum of its proper divisors (242123219).

65131073281 is a wasteful number, since it uses less digits than its factorization.

65131073281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242123218.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 65131073281 in words is "sixty-five billion, one hundred thirty-one million, seventy-three thousand, two hundred eighty-one".