866509307211 has 16 divisors (see below), whose sum is σ = 1159763862816. Its totient is φ = 575467047936.

The previous prime is 866509307179. The next prime is 866509307221. The reversal of 866509307211 is 112703905668.

It is not a de Polignac number, because 866509307211 - 2⁵ = 866509307179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866509307221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 668901 + ... + 1476633.

It is an arithmetic number, because the mean of its divisors is an integer number (72485241426).

Almost surely, 2^866509307211 is an apocalyptic number.

866509307211 is a deficient number, since it is larger than the sum of its proper divisors (293254555605).

866509307211 is a wasteful number, since it uses less digits than its factorization.

866509307211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809102.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 866509307211 in words is "eight hundred sixty-six billion, five hundred nine million, three hundred seven thousand, two hundred eleven".