81068315771 has 2 divisors, whose sum is σ = 81068315772. Its totient is φ = 81068315770.

The previous prime is 81068315753. The next prime is 81068315789. The reversal of 81068315771 is 17751386018.

It is a balanced prime because it is at equal distance from previous prime (81068315753) and next prime (81068315789).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81068315771 is a prime.

It is not a weakly prime, because it can be changed into another prime (81068315711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40534157885 + 40534157886.

It is an arithmetic number, because the mean of its divisors is an integer number (40534157886).

Almost surely, 2^81068315771 is an apocalyptic number.

81068315771 is a deficient number, since it is larger than the sum of its proper divisors (1).

81068315771 is an equidigital number, since it uses as much as digits as its factorization.

81068315771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 47.

The spelling of 81068315771 in words is "eighty-one billion, sixty-eight million, three hundred fifteen thousand, seven hundred seventy-one".