81068315753 has 2 divisors, whose sum is σ = 81068315754. Its totient is φ = 81068315752.

The previous prime is 81068315749. The next prime is 81068315771. The reversal of 81068315753 is 35751386018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44843568169 + 36224747584 = 211763^2 + 190328^2 .

It is a cyclic number.

It is not a de Polignac number, because 81068315753 - 2² = 81068315749 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81068315698 and 81068315707.

It is not a weakly prime, because it can be changed into another prime (81068315953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40534157876 + 40534157877.

It is an arithmetic number, because the mean of its divisors is an integer number (40534157877).

Almost surely, 2^81068315753 is an apocalyptic number.

It is an amenable number.

81068315753 is a deficient number, since it is larger than the sum of its proper divisors (1).

81068315753 is an equidigital number, since it uses as much as digits as its factorization.

81068315753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 81068315753 in words is "eighty-one billion, sixty-eight million, three hundred fifteen thousand, seven hundred fifty-three".