866686680707 has 2 divisors, whose sum is σ = 866686680708. Its totient is φ = 866686680706.

The previous prime is 866686680649. The next prime is 866686680757. The reversal of 866686680707 is 707086686668.

866686680707 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 is a cyclic number.

It is not a de Polignac number, because 866686680707 - 2²² = 866682486403 is a prime.

It is a super-2 number, since 2×866686680707² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (866686680757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433343340353 + 433343340354.

It is an arithmetic number, because the mean of its divisors is an integer number (433343340354).

Almost surely, 2^866686680707 is an apocalyptic number.

866686680707 is a deficient number, since it is larger than the sum of its proper divisors (1).

866686680707 is an equidigital number, since it uses as much as digits as its factorization.

866686680707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 195084288, while the sum is 68.

The spelling of 866686680707 in words is "eight hundred sixty-six billion, six hundred eighty-six million, six hundred eighty thousand, seven hundred seven".