81766327 has 2 divisors, whose sum is σ = 81766328. Its totient is φ = 81766326.

The previous prime is 81766319. The next prime is 81766381. The reversal of 81766327 is 72366718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81766327 - 2³ = 81766319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81766327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81766387) 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, 40883163 + 40883164.

It is an arithmetic number, because the mean of its divisors is an integer number (40883164).

Almost surely, 2^81766327 is an apocalyptic number.

81766327 is a deficient number, since it is larger than the sum of its proper divisors (1).

81766327 is an equidigital number, since it uses as much as digits as its factorization.

81766327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 81766327 is about 9042.4735000994. The cubic root of 81766327 is about 434.0350778984.

The spelling of 81766327 in words is "eighty-one million, seven hundred sixty-six thousand, three hundred twenty-seven".