868595866 has 4 divisors (see below), whose sum is σ = 1302893802. Its totient is φ = 434297932.

The previous prime is 868595843. The next prime is 868595879. The reversal of 868595866 is 668595868.

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., 569824641 + 298771225 = 23871^2 + 17285^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217148965 + ... + 217148968.

Almost surely, 2^868595866 is an apocalyptic number.

868595866 is a deficient number, since it is larger than the sum of its proper divisors (434297936).

868595866 is a wasteful number, since it uses less digits than its factorization.

868595866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434297935.

The product of its digits is 24883200, while the sum is 61.

The square root of 868595866 is about 29471.9504953439. The cubic root of 868595866 is about 954.1264147505.

The spelling of 868595866 in words is "eight hundred sixty-eight million, five hundred ninety-five thousand, eight hundred sixty-six".