81425225338201 has 2 divisors, whose sum is σ = 81425225338202. Its totient is φ = 81425225338200.

The previous prime is 81425225338199. The next prime is 81425225338271. The reversal of 81425225338201 is 10283352252418.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75378426305625 + 6046799032576 = 8682075^2 + 2459024^2 .

It is a cyclic number.

It is not a de Polignac number, because 81425225338201 - 2¹ = 81425225338199 is a prime.

Together with 81425225338199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (81425225338271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40712612669100 + 40712612669101.

It is an arithmetic number, because the mean of its divisors is an integer number (40712612669101).

Almost surely, 2^{81425225338201} is an apocalyptic number.

It is an amenable number.

81425225338201 is a deficient number, since it is larger than the sum of its proper divisors (1).

81425225338201 is an equidigital number, since it uses as much as digits as its factorization.

81425225338201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 81425225338201 in words is "eighty-one trillion, four hundred twenty-five billion, two hundred twenty-five million, three hundred thirty-eight thousand, two hundred one".