866279871 has 6 divisors (see below), whose sum is σ = 1251293160. Its totient is φ = 577519908.

The previous prime is 866279867. The next prime is 866279873. The reversal of 866279871 is 178972668.

866279871 is a `hidden beast` number, since 8 + 6 + 627 + 9 + 8 + 7 + 1 = 666.

It is not a de Polignac number, because 866279871 - 2² = 866279867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866279873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48126651 + ... + 48126668.

It is an arithmetic number, because the mean of its divisors is an integer number (208548860).

Almost surely, 2^866279871 is an apocalyptic number.

866279871 is a deficient number, since it is larger than the sum of its proper divisors (385013289).

866279871 is a wasteful number, since it uses less digits than its factorization.

866279871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96253325 (or 96253322 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 866279871 is about 29432.6327568568. The cubic root of 866279871 is about 953.2776429914.

The spelling of 866279871 in words is "eight hundred sixty-six million, two hundred seventy-nine thousand, eight hundred seventy-one".