81863957775583 has 2 divisors, whose sum is σ = 81863957775584. Its totient is φ = 81863957775582.

The previous prime is 81863957775557. The next prime is 81863957775623. The reversal of 81863957775583 is 38557775936818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81863957775583 - 2³⁷ = 81726518822111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81863957775497 and 81863957775506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81863955775583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40931978887791 + 40931978887792.

It is an arithmetic number, because the mean of its divisors is an integer number (40931978887792).

Almost surely, 2^{81863957775583} is an apocalyptic number.

81863957775583 is a deficient number, since it is larger than the sum of its proper divisors (1).

81863957775583 is an equidigital number, since it uses as much as digits as its factorization.

81863957775583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672000, while the sum is 82.

The spelling of 81863957775583 in words is "eighty-one trillion, eight hundred sixty-three billion, nine hundred fifty-seven million, seven hundred seventy-five thousand, five hundred eighty-three".