81812701459 has 2 divisors, whose sum is σ = 81812701460. Its totient is φ = 81812701458.

The previous prime is 81812701457. The next prime is 81812701511. The reversal of 81812701459 is 95410721818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81812701459 - 2¹ = 81812701457 is a prime.

Together with 81812701457, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81812701457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40906350729 + 40906350730.

It is an arithmetic number, because the mean of its divisors is an integer number (40906350730).

Almost surely, 2^81812701459 is an apocalyptic number.

81812701459 is a deficient number, since it is larger than the sum of its proper divisors (1).

81812701459 is an equidigital number, since it uses as much as digits as its factorization.

81812701459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 46.

The spelling of 81812701459 in words is "eighty-one billion, eight hundred twelve million, seven hundred one thousand, four hundred fifty-nine".