81311336568683 has 16 divisors (see below), whose sum is σ = 88469538776640. Its totient is φ = 74282216472576.

The previous prime is 81311336568677. The next prime is 81311336568731. The reversal of 81311336568683 is 38686563311318.

It is a cyclic number.

It is not a de Polignac number, because 81311336568683 - 2²⁴ = 81311319791467 is a prime.

It is a super-2 number, since 2×81311336568683² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81311336568653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224326091 + ... + 224688267.

It is an arithmetic number, because the mean of its divisors is an integer number (5529346173540).

Almost surely, 2^{81311336568683} is an apocalyptic number.

81311336568683 is a deficient number, since it is larger than the sum of its proper divisors (7158202207957).

81311336568683 is a wasteful number, since it uses less digits than its factorization.

81311336568683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540326.

The product of its digits is 44789760, while the sum is 62.

The spelling of 81311336568683 in words is "eighty-one trillion, three hundred eleven billion, three hundred thirty-six million, five hundred sixty-eight thousand, six hundred eighty-three".