81674841571 has 2 divisors, whose sum is σ = 81674841572. Its totient is φ = 81674841570.

The previous prime is 81674841559. The next prime is 81674841623. The reversal of 81674841571 is 17514847618.

It is an a-pointer prime, because the next prime (81674841623) can be obtained adding 81674841571 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81674841571 - 2¹⁷ = 81674710499 is a prime.

It is not a weakly prime, because it can be changed into another prime (81674841071) 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, 40837420785 + 40837420786.

It is an arithmetic number, because the mean of its divisors is an integer number (40837420786).

Almost surely, 2^81674841571 is an apocalyptic number.

81674841571 is a deficient number, since it is larger than the sum of its proper divisors (1).

81674841571 is an equidigital number, since it uses as much as digits as its factorization.

81674841571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1505280, while the sum is 52.

The spelling of 81674841571 in words is "eighty-one billion, six hundred seventy-four million, eight hundred forty-one thousand, five hundred seventy-one".