81094687045643 has 2 divisors, whose sum is σ = 81094687045644. Its totient is φ = 81094687045642.

The previous prime is 81094687045613. The next prime is 81094687045651. The reversal of 81094687045643 is 34654078649018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81094687045643 - 2⁸ = 81094687045387 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81094687045643.

It is not a weakly prime, because it can be changed into another prime (81094687045613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40547343522821 + 40547343522822.

It is an arithmetic number, because the mean of its divisors is an integer number (40547343522822).

Almost surely, 2^{81094687045643} is an apocalyptic number.

81094687045643 is a deficient number, since it is larger than the sum of its proper divisors (1).

81094687045643 is an equidigital number, since it uses as much as digits as its factorization.

81094687045643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139345920, while the sum is 65.

The spelling of 81094687045643 in words is "eighty-one trillion, ninety-four billion, six hundred eighty-seven million, forty-five thousand, six hundred forty-three".