866146187 has 2 divisors, whose sum is σ = 866146188. Its totient is φ = 866146186.

The previous prime is 866146153. The next prime is 866146189. The reversal of 866146187 is 781641668.

866146187 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 866146187 - 2⁶ = 866146123 is a prime.

Together with 866146189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (866146189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433073093 + 433073094.

It is an arithmetic number, because the mean of its divisors is an integer number (433073094).

Almost surely, 2^866146187 is an apocalyptic number.

866146187 is a deficient number, since it is larger than the sum of its proper divisors (1).

866146187 is an equidigital number, since it uses as much as digits as its factorization.

866146187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 866146187 is about 29430.3616525519. The cubic root of 866146187 is about 953.2286039804.

The spelling of 866146187 in words is "eight hundred sixty-six million, one hundred forty-six thousand, one hundred eighty-seven".