866118887 has 4 divisors (see below), whose sum is σ = 870957720. Its totient is φ = 861280056.

The previous prime is 866118859. The next prime is 866118893. The reversal of 866118887 is 788811668.

It is a happy number.

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 866118887 - 2⁶ = 866118823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (860118887) 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, 2419148 + ... + 2419505.

It is an arithmetic number, because the mean of its divisors is an integer number (217739430).

Almost surely, 2^866118887 is an apocalyptic number.

866118887 is a deficient number, since it is larger than the sum of its proper divisors (4838833).

866118887 is a wasteful number, since it uses less digits than its factorization.

866118887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4838832.

The product of its digits is 1032192, while the sum is 53.

The square root of 866118887 is about 29429.8978421604. The cubic root of 866118887 is about 953.2185889604.

The spelling of 866118887 in words is "eight hundred sixty-six million, one hundred eighteen thousand, eight hundred eighty-seven".