866786278670331 has 8 divisors (see below), whose sum is σ = 1171992714822144. Its totient is φ = 569718680816040.

The previous prime is 866786278670261. The next prime is 866786278670401. The reversal of 866786278670331 is 133076872687668.

It is an interprime number because it is at equal distance from previous prime (866786278670261) and next prime (866786278670401).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 866786278670331 - 2¹⁵ = 866786278637563 is a prime.

It is a super-2 number, since 2×866786278670331² (a number of 31 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (866786278670131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2034709574131 + ... + 2034709574556.

It is an arithmetic number, because the mean of its divisors is an integer number (146499089352768).

Almost surely, 2^{866786278670331} is an apocalyptic number.

866786278670331 is a deficient number, since it is larger than the sum of its proper divisors (305206436151813).

866786278670331 is a wasteful number, since it uses less digits than its factorization.

866786278670331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069419148761.

The product of its (nonzero) digits is 4096770048, while the sum is 78.

The spelling of 866786278670331 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, two hundred seventy-eight million, six hundred seventy thousand, three hundred thirty-one".