82366777766389 has 2 divisors, whose sum is σ = 82366777766390. Its totient is φ = 82366777766388.

The previous prime is 82366777766323. The next prime is 82366777766509. The reversal of 82366777766389 is 98366777766328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54744342719364 + 27622435047025 = 7398942^2 + 5255705^2 .

It is a cyclic number.

It is not a de Polignac number, because 82366777766389 - 2¹³ = 82366777758197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82366777766309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41183388883194 + 41183388883195.

It is an arithmetic number, because the mean of its divisors is an integer number (41183388883195).

Almost surely, 2^{82366777766389} is an apocalyptic number.

It is an amenable number.

82366777766389 is a deficient number, since it is larger than the sum of its proper divisors (1).

82366777766389 is an equidigital number, since it uses as much as digits as its factorization.

82366777766389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32262064128, while the sum is 85.

The spelling of 82366777766389 in words is "eighty-two trillion, three hundred sixty-six billion, seven hundred seventy-seven million, seven hundred sixty-six thousand, three hundred eighty-nine".