81384377351 has 2 divisors, whose sum is σ = 81384377352. Its totient is φ = 81384377350.

The previous prime is 81384377341. The next prime is 81384377357. The reversal of 81384377351 is 15377348318.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81384377351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81384377351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81384377357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40692188675 + 40692188676.

It is an arithmetic number, because the mean of its divisors is an integer number (40692188676).

Almost surely, 2^81384377351 is an apocalyptic number.

81384377351 is a deficient number, since it is larger than the sum of its proper divisors (1).

81384377351 is an equidigital number, since it uses as much as digits as its factorization.

81384377351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 50.

The spelling of 81384377351 in words is "eighty-one billion, three hundred eighty-four million, three hundred seventy-seven thousand, three hundred fifty-one".