81634503113 has 2 divisors, whose sum is σ = 81634503114. Its totient is φ = 81634503112.

The previous prime is 81634503091. The next prime is 81634503127. The reversal of 81634503113 is 31130543618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81332195344 + 302307769 = 285188^2 + 17387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81634503113 is a prime.

It is not a weakly prime, because it can be changed into another prime (81634803113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40817251556 + 40817251557.

It is an arithmetic number, because the mean of its divisors is an integer number (40817251557).

Almost surely, 2^81634503113 is an apocalyptic number.

It is an amenable number.

81634503113 is a deficient number, since it is larger than the sum of its proper divisors (1).

81634503113 is an equidigital number, since it uses as much as digits as its factorization.

81634503113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 81634503113 in words is "eighty-one billion, six hundred thirty-four million, five hundred three thousand, one hundred thirteen".