866805283078187 has 4 divisors (see below), whose sum is σ = 866897584789536. Its totient is φ = 866712981366840.

The previous prime is 866805283078177. The next prime is 866805283078211. The reversal of 866805283078187 is 781870382508668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866805283078187 - 2⁴ = 866805283078171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866805283078117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46150841588 + ... + 46150860369.

It is an arithmetic number, because the mean of its divisors is an integer number (216724396197384).

Almost surely, 2^{866805283078187} is an apocalyptic number.

866805283078187 is a deficient number, since it is larger than the sum of its proper divisors (92301711349).

866805283078187 is an equidigital number, since it uses as much as digits as its factorization.

866805283078187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92301711348.

The product of its (nonzero) digits is 1734082560, while the sum is 77.

The spelling of 866805283078187 in words is "eight hundred sixty-six trillion, eight hundred five billion, two hundred eighty-three million, seventy-eight thousand, one hundred eighty-seven".