866621159999 has 8 divisors (see below), whose sum is σ = 995401190400. Its totient is φ = 739085381496.

The previous prime is 866621159977. The next prime is 866621160007. The reversal of 866621159999 is 999951126668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-866621159999 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 (866621159969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311061479 + ... + 311064264.

It is an arithmetic number, because the mean of its divisors is an integer number (124425148800).

Almost surely, 2^866621159999 is an apocalyptic number.

866621159999 is a deficient number, since it is larger than the sum of its proper divisors (128780030401).

866621159999 is a wasteful number, since it uses less digits than its factorization.

866621159999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622125949.

The product of its digits is 113374080, while the sum is 71.

The spelling of 866621159999 in words is "eight hundred sixty-six billion, six hundred twenty-one million, one hundred fifty-nine thousand, nine hundred ninety-nine".