866799997668 has 144 divisors (see below), whose sum is σ = 2539520343360. Its totient is φ = 246754771200.

The previous prime is 866799997663. The next prime is 866799997831.

It is a happy number.

866799997668 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (866799997663) 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 47 ways as a sum of consecutive naturals, for example, 595078 + ... + 1444893.

It is an arithmetic number, because the mean of its divisors is an integer number (17635557940).

Almost surely, 2^866799997668 is an apocalyptic number.

It is an amenable number.

866799997668 is an abundant number, since it is smaller than the sum of its proper divisors (1672720345692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866799997668 is a wasteful number, since it uses less digits than its factorization.

866799997668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040058 (or 2040053 counting only the distinct ones).

The product of its digits is 26665583616, while the sum is 90.

The spelling of 866799997668 in words is "eight hundred sixty-six billion, seven hundred ninety-nine million, nine hundred ninety-seven thousand, six hundred sixty-eight".