81634503127 has 2 divisors, whose sum is σ = 81634503128. Its totient is φ = 81634503126.

The previous prime is 81634503113. The next prime is 81634503161. The reversal of 81634503127 is 72130543618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81634503127 - 2³⁵ = 47274764759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81634503127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81634543127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40817251563 + 40817251564.

It is an arithmetic number, because the mean of its divisors is an integer number (40817251564).

Almost surely, 2^81634503127 is an apocalyptic number.

81634503127 is a deficient number, since it is larger than the sum of its proper divisors (1).

81634503127 is an equidigital number, since it uses as much as digits as its factorization.

81634503127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 81634503127 in words is "eighty-one billion, six hundred thirty-four million, five hundred three thousand, one hundred twenty-seven".