866777871 has 4 divisors (see below), whose sum is σ = 1155703832. Its totient is φ = 577851912.

The previous prime is 866777867. The next prime is 866777903. The reversal of 866777871 is 178777668.

It is a happy number.

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

It is not a de Polignac number, because 866777871 - 2² = 866777867 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 (866777831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144462976 + ... + 144462981.

It is an arithmetic number, because the mean of its divisors is an integer number (288925958).

Almost surely, 2^866777871 is an apocalyptic number.

866777871 is a deficient number, since it is larger than the sum of its proper divisors (288925961).

866777871 is a wasteful number, since it uses less digits than its factorization.

866777871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288925960.

The product of its digits is 5531904, while the sum is 57.

The square root of 866777871 is about 29441.0915388679. The cubic root of 866777871 is about 953.4602788581.

The spelling of 866777871 in words is "eight hundred sixty-six million, seven hundred seventy-seven thousand, eight hundred seventy-one".