81334673347 has 2 divisors, whose sum is σ = 81334673348. Its totient is φ = 81334673346.

The previous prime is 81334673293. The next prime is 81334673363. The reversal of 81334673347 is 74337643318.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81334673347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81334673347.

It is not a weakly prime, because it can be changed into another prime (81334673047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40667336673 + 40667336674.

It is an arithmetic number, because the mean of its divisors is an integer number (40667336674).

Almost surely, 2^81334673347 is an apocalyptic number.

81334673347 is a deficient number, since it is larger than the sum of its proper divisors (1).

81334673347 is an equidigital number, since it uses as much as digits as its factorization.

81334673347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 49.

The spelling of 81334673347 in words is "eighty-one billion, three hundred thirty-four million, six hundred seventy-three thousand, three hundred forty-seven".