81083064793 has 4 divisors (see below), whose sum is σ = 81083705508. Its totient is φ = 81082424080.

The previous prime is 81083064761. The next prime is 81083064823. The reversal of 81083064793 is 39746038018.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39746038018 = 2 ⋅19873019009.

It can be written as a sum of positive squares in 2 ways, for example, as 27334670224 + 53748394569 = 165332^2 + 231837^2 .

It is a cyclic number.

It is not a de Polignac number, because 81083064793 - 2⁵ = 81083064761 is a prime.

It is a super-2 number, since 2×81083064793² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81083064703) 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 3 ways as a sum of consecutive naturals, for example, 59998 + ... + 407143.

It is an arithmetic number, because the mean of its divisors is an integer number (20270926377).

Almost surely, 2^81083064793 is an apocalyptic number.

It is an amenable number.

81083064793 is a deficient number, since it is larger than the sum of its proper divisors (640715).

81083064793 is a wasteful number, since it uses less digits than its factorization.

81083064793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640714.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 81083064793 in words is "eighty-one billion, eighty-three million, sixty-four thousand, seven hundred ninety-three".