866986361 has 2 divisors, whose sum is σ = 866986362. Its totient is φ = 866986360.

The previous prime is 866986343. The next prime is 866986381. The reversal of 866986361 is 163689668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499075600 + 367910761 = 22340^2 + 19181^2 .

It is a cyclic number.

It is not a de Polignac number, because 866986361 - 2¹⁸ = 866724217 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866986381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433493180 + 433493181.

It is an arithmetic number, because the mean of its divisors is an integer number (433493181).

Almost surely, 2^866986361 is an apocalyptic number.

It is an amenable number.

866986361 is a deficient number, since it is larger than the sum of its proper divisors (1).

866986361 is an equidigital number, since it uses as much as digits as its factorization.

866986361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 53.

The square root of 866986361 is about 29444.6321253977. The cubic root of 866986361 is about 953.5367194334.

The spelling of 866986361 in words is "eight hundred sixty-six million, nine hundred eighty-six thousand, three hundred sixty-one".