81427300263329 has 2 divisors, whose sum is σ = 81427300263330. Its totient is φ = 81427300263328.

The previous prime is 81427300263307. The next prime is 81427300263437. The reversal of 81427300263329 is 92336200372418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52460353674304 + 28966946589025 = 7242952^2 + 5382095^2 .

It is a cyclic number.

It is not a de Polignac number, because 81427300263329 - 2¹² = 81427300259233 is a prime.

It is not a weakly prime, because it can be changed into another prime (81427300265329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40713650131664 + 40713650131665.

It is an arithmetic number, because the mean of its divisors is an integer number (40713650131665).

Almost surely, 2^{81427300263329} is an apocalyptic number.

It is an amenable number.

81427300263329 is a deficient number, since it is larger than the sum of its proper divisors (1).

81427300263329 is an equidigital number, since it uses as much as digits as its factorization.

81427300263329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 50.

The spelling of 81427300263329 in words is "eighty-one trillion, four hundred twenty-seven billion, three hundred million, two hundred sixty-three thousand, three hundred twenty-nine".