81116439343 has 2 divisors, whose sum is σ = 81116439344. Its totient is φ = 81116439342.

The previous prime is 81116439337. The next prime is 81116439401. The reversal of 81116439343 is 34393461118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81116439343 - 2¹⁷ = 81116308271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81116439343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81116439043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40558219671 + 40558219672.

It is an arithmetic number, because the mean of its divisors is an integer number (40558219672).

Almost surely, 2^81116439343 is an apocalyptic number.

81116439343 is a deficient number, since it is larger than the sum of its proper divisors (1).

81116439343 is an equidigital number, since it uses as much as digits as its factorization.

81116439343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The spelling of 81116439343 in words is "eighty-one billion, one hundred sixteen million, four hundred thirty-nine thousand, three hundred forty-three".