81425145611 has 2 divisors, whose sum is σ = 81425145612. Its totient is φ = 81425145610.

The previous prime is 81425145523. The next prime is 81425145619. The reversal of 81425145611 is 11654152418.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81425145611 - 2¹⁰ = 81425144587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81425145619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40712572805 + 40712572806.

It is an arithmetic number, because the mean of its divisors is an integer number (40712572806).

Almost surely, 2^81425145611 is an apocalyptic number.

81425145611 is a deficient number, since it is larger than the sum of its proper divisors (1).

81425145611 is an equidigital number, since it uses as much as digits as its factorization.

81425145611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 38.

The spelling of 81425145611 in words is "eighty-one billion, four hundred twenty-five million, one hundred forty-five thousand, six hundred eleven".