81425225338199 has 2 divisors, whose sum is σ = 81425225338200. Its totient is φ = 81425225338198.

The previous prime is 81425225338063. The next prime is 81425225338201. The reversal of 81425225338199 is 99183352252418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81425225338199 - 2⁴⁰ = 80325713710423 is a prime.

Together with 81425225338201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81425225238199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40712612669099 + 40712612669100.

It is an arithmetic number, because the mean of its divisors is an integer number (40712612669100).

Almost surely, 2^{81425225338199} is an apocalyptic number.

81425225338199 is a deficient number, since it is larger than the sum of its proper divisors (1).

81425225338199 is an equidigital number, since it uses as much as digits as its factorization.

81425225338199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37324800, while the sum is 62.

The spelling of 81425225338199 in words is "eighty-one trillion, four hundred twenty-five billion, two hundred twenty-five million, three hundred thirty-eight thousand, one hundred ninety-nine".