81527209363 has 2 divisors, whose sum is σ = 81527209364. Its totient is φ = 81527209362.

The previous prime is 81527209277. The next prime is 81527209391. The reversal of 81527209363 is 36390272518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81527209363 is a prime.

It is not a weakly prime, because it can be changed into another prime (81527201363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40763604681 + 40763604682.

It is an arithmetic number, because the mean of its divisors is an integer number (40763604682).

Almost surely, 2^81527209363 is an apocalyptic number.

81527209363 is a deficient number, since it is larger than the sum of its proper divisors (1).

81527209363 is an equidigital number, since it uses as much as digits as its factorization.

81527209363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 81527209363 in words is "eighty-one billion, five hundred twenty-seven million, two hundred nine thousand, three hundred sixty-three".