81340746743 has 2 divisors, whose sum is σ = 81340746744. Its totient is φ = 81340746742.

The previous prime is 81340746713. The next prime is 81340746749. The reversal of 81340746743 is 34764704318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81340746743 - 2⁶ = 81340746679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81340746749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670373371 + 40670373372.

It is an arithmetic number, because the mean of its divisors is an integer number (40670373372).

Almost surely, 2^81340746743 is an apocalyptic number.

81340746743 is a deficient number, since it is larger than the sum of its proper divisors (1).

81340746743 is an equidigital number, since it uses as much as digits as its factorization.

81340746743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 47.

The spelling of 81340746743 in words is "eighty-one billion, three hundred forty million, seven hundred forty-six thousand, seven hundred forty-three".