65845623881 has 6 divisors (see below), whose sum is σ = 69946735710. Its totient is φ = 61972351616.

The previous prime is 65845623841. The next prime is 65845623917. The reversal of 65845623881 is 18832654856.

It can be written as a sum of positive squares in 3 ways, for example, as 6962233600 + 58883390281 = 83440^2 + 242659^2 .

It is not a de Polignac number, because 65845623881 - 2¹⁴ = 65845607497 is a prime.

It is a super-2 number, since 2×65845623881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65845623841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 113919476 + ... + 113920053.

It is an arithmetic number, because the mean of its divisors is an integer number (11657789285).

Almost surely, 2^65845623881 is an apocalyptic number.

It is an amenable number.

65845623881 is a deficient number, since it is larger than the sum of its proper divisors (4101111829).

65845623881 is a wasteful number, since it uses less digits than its factorization.

65845623881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227839563 (or 227839546 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 56.

The spelling of 65845623881 in words is "sixty-five billion, eight hundred forty-five million, six hundred twenty-three thousand, eight hundred eighty-one".