81888799788863 has 2 divisors, whose sum is σ = 81888799788864. Its totient is φ = 81888799788862.

The previous prime is 81888799788767. The next prime is 81888799788877. The reversal of 81888799788863 is 36888799788818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81888799788863 - 2⁴⁶ = 11520055611199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81888799788863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81888790788863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40944399894431 + 40944399894432.

It is an arithmetic number, because the mean of its divisors is an integer number (40944399894432).

Almost surely, 2^{81888799788863} is an apocalyptic number.

81888799788863 is a deficient number, since it is larger than the sum of its proper divisors (1).

81888799788863 is an equidigital number, since it uses as much as digits as its factorization.

81888799788863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 149824733184, while the sum is 98.

The spelling of 81888799788863 in words is "eighty-one trillion, eight hundred eighty-eight billion, seven hundred ninety-nine million, seven hundred eighty-eight thousand, eight hundred sixty-three".