866599995668 has 12 divisors (see below), whose sum is σ = 1654418173632. Its totient is φ = 393909088920.

The previous prime is 866599995647. The next prime is 866599995689.

866599995668 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (866599995647) and next prime (866599995689).

It is a self number, because there is not a number n which added to its sum of digits gives 866599995668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9847727180 + ... + 9847727267.

It is an arithmetic number, because the mean of its divisors is an integer number (137868181136).

Almost surely, 2^866599995668 is an apocalyptic number.

It is an amenable number.

866599995668 is a deficient number, since it is larger than the sum of its proper divisors (787818177964).

866599995668 is a wasteful number, since it uses less digits than its factorization.

866599995668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19695454462 (or 19695454460 counting only the distinct ones).

The product of its digits is 13604889600, while the sum is 86.

The spelling of 866599995668 in words is "eight hundred sixty-six billion, five hundred ninety-nine million, nine hundred ninety-five thousand, six hundred sixty-eight".