81598894511 has 2 divisors, whose sum is σ = 81598894512. Its totient is φ = 81598894510.

The previous prime is 81598894459. The next prime is 81598894523. The reversal of 81598894511 is 11549889518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81598894511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81598894561) 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, 40799447255 + 40799447256.

It is an arithmetic number, because the mean of its divisors is an integer number (40799447256).

Almost surely, 2^81598894511 is an apocalyptic number.

81598894511 is a deficient number, since it is larger than the sum of its proper divisors (1).

81598894511 is an equidigital number, since it uses as much as digits as its factorization.

81598894511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4147200, while the sum is 59.

The spelling of 81598894511 in words is "eighty-one billion, five hundred ninety-eight million, eight hundred ninety-four thousand, five hundred eleven".