866507855138711 has 2 divisors, whose sum is σ = 866507855138712. Its totient is φ = 866507855138710.

The previous prime is 866507855138659. The next prime is 866507855138771. The reversal of 866507855138711 is 117831558705668.

866507855138711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866507855138711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866507855138771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433253927569355 + 433253927569356.

It is an arithmetic number, because the mean of its divisors is an integer number (433253927569356).

Almost surely, 2^{866507855138711} is an apocalyptic number.

866507855138711 is a deficient number, since it is larger than the sum of its proper divisors (1).

866507855138711 is an equidigital number, since it uses as much as digits as its factorization.

866507855138711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688000, while the sum is 71.

The spelling of 866507855138711 in words is "eight hundred sixty-six trillion, five hundred seven billion, eight hundred fifty-five million, one hundred thirty-eight thousand, seven hundred eleven".