82386705721 has 2 divisors, whose sum is σ = 82386705722. Its totient is φ = 82386705720.

The previous prime is 82386705703. The next prime is 82386705763. The reversal of 82386705721 is 12750768328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45958784400 + 36427921321 = 214380^2 + 190861^2 .

It is a cyclic number.

It is not a de Polignac number, because 82386705721 - 2¹³ = 82386697529 is a prime.

It is not a weakly prime, because it can be changed into another prime (82386705701) 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, 41193352860 + 41193352861.

It is an arithmetic number, because the mean of its divisors is an integer number (41193352861).

Almost surely, 2^82386705721 is an apocalyptic number.

It is an amenable number.

82386705721 is a deficient number, since it is larger than the sum of its proper divisors (1).

82386705721 is an equidigital number, since it uses as much as digits as its factorization.

82386705721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 82386705721 in words is "eighty-two billion, three hundred eighty-six million, seven hundred five thousand, seven hundred twenty-one".