866805076034243 has 2 divisors, whose sum is σ = 866805076034244. Its totient is φ = 866805076034242.

The previous prime is 866805076034179. The next prime is 866805076034267. The reversal of 866805076034243 is 342430670508668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866805076034243 - 2⁶ = 866805076034179 is a prime.

It is a super-2 number, since 2×866805076034243² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866805076034543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433402538017121 + 433402538017122.

It is an arithmetic number, because the mean of its divisors is an integer number (433402538017122).

Almost surely, 2^{866805076034243} is an apocalyptic number.

866805076034243 is a deficient number, since it is larger than the sum of its proper divisors (1).

866805076034243 is an equidigital number, since it uses as much as digits as its factorization.

866805076034243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139345920, while the sum is 62.

The spelling of 866805076034243 in words is "eight hundred sixty-six trillion, eight hundred five billion, seventy-six million, thirty-four thousand, two hundred forty-three".