81599401883 has 2 divisors, whose sum is σ = 81599401884. Its totient is φ = 81599401882.

The previous prime is 81599401867. The next prime is 81599401903. The reversal of 81599401883 is 38810499518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81599401883 - 2⁴ = 81599401867 is a prime.

It is not a weakly prime, because it can be changed into another prime (81599401823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40799700941 + 40799700942.

It is an arithmetic number, because the mean of its divisors is an integer number (40799700942).

Almost surely, 2^81599401883 is an apocalyptic number.

81599401883 is a deficient number, since it is larger than the sum of its proper divisors (1).

81599401883 is an equidigital number, since it uses as much as digits as its factorization.

81599401883 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The spelling of 81599401883 in words is "eighty-one billion, five hundred ninety-nine million, four hundred one thousand, eight hundred eighty-three".