81094687045613 has 2 divisors, whose sum is σ = 81094687045614. Its totient is φ = 81094687045612.

The previous prime is 81094687045609. The next prime is 81094687045643. The reversal of 81094687045613 is 31654078649018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49532909113444 + 31561777932169 = 7037962^2 + 5617987^2 .

It is a cyclic number.

It is not a de Polignac number, because 81094687045613 - 2² = 81094687045609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81094687045643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40547343522806 + 40547343522807.

It is an arithmetic number, because the mean of its divisors is an integer number (40547343522807).

Almost surely, 2^{81094687045613} is an apocalyptic number.

It is an amenable number.

81094687045613 is a deficient number, since it is larger than the sum of its proper divisors (1).

81094687045613 is an equidigital number, since it uses as much as digits as its factorization.

81094687045613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 81094687045613 in words is "eighty-one trillion, ninety-four billion, six hundred eighty-seven million, forty-five thousand, six hundred thirteen".