866751866 has 4 divisors (see below), whose sum is σ = 1300127802. Its totient is φ = 433375932.

The previous prime is 866751859. The next prime is 866751871. The reversal of 866751866 is 668157668.

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

It can be written as a sum of positive squares in only one way, i.e., 556252225 + 310499641 = 23585^2 + 17621^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 216687965 + ... + 216687968.

Almost surely, 2^866751866 is an apocalyptic number.

866751866 is a deficient number, since it is larger than the sum of its proper divisors (433375936).

866751866 is a wasteful number, since it uses less digits than its factorization.

866751866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433375935.

The product of its digits is 2903040, while the sum is 53.

The square root of 866751866 is about 29440.6498909246. The cubic root of 866751866 is about 953.4507435499.

The spelling of 866751866 in words is "eight hundred sixty-six million, seven hundred fifty-one thousand, eight hundred sixty-six".