866715937393 has 2 divisors, whose sum is σ = 866715937394. Its totient is φ = 866715937392.

The previous prime is 866715937363. The next prime is 866715937403. The reversal of 866715937393 is 393739517668.

866715937393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863176639329 + 3539298064 = 929073^2 + 59492^2 .

It is a cyclic number.

It is not a de Polignac number, because 866715937393 - 2⁹ = 866715936881 is a prime.

It is a super-2 number, since 2×866715937393² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866715937363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433357968696 + 433357968697.

It is an arithmetic number, because the mean of its divisors is an integer number (433357968697).

Almost surely, 2^866715937393 is an apocalyptic number.

It is an amenable number.

866715937393 is a deficient number, since it is larger than the sum of its proper divisors (1).

866715937393 is an equidigital number, since it uses as much as digits as its factorization.

866715937393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 154314720, while the sum is 67.

The spelling of 866715937393 in words is "eight hundred sixty-six billion, seven hundred fifteen million, nine hundred thirty-seven thousand, three hundred ninety-three".