866704493 has 2 divisors, whose sum is σ = 866704494. Its totient is φ = 866704492.

The previous prime is 866704471. The next prime is 866704499. The reversal of 866704493 is 394407668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 718400809 + 148303684 = 26803^2 + 12178^2 .

It is a cyclic number.

It is not a de Polignac number, because 866704493 - 2¹² = 866700397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866704499) 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, 433352246 + 433352247.

It is an arithmetic number, because the mean of its divisors is an integer number (433352247).

Almost surely, 2^866704493 is an apocalyptic number.

It is an amenable number.

866704493 is a deficient number, since it is larger than the sum of its proper divisors (1).

866704493 is an equidigital number, since it uses as much as digits as its factorization.

866704493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 47.

The square root of 866704493 is about 29439.8453290774. The cubic root of 866704493 is about 953.4333727018.

The spelling of 866704493 in words is "eight hundred sixty-six million, seven hundred four thousand, four hundred ninety-three".