866802636072681 has 96 divisors (see below), whose sum is σ = 1490335075891200. Its totient is φ = 447590743094880.

The previous prime is 866802636072643. The next prime is 866802636072683. The reversal of 866802636072681 is 186270636208668.

It is not a de Polignac number, because 866802636072681 - 2¹⁰ = 866802636071657 is a prime.

It is a super-2 number, since 2×866802636072681² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866802636072683) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 50611 + ... + 41636616.

It is an arithmetic number, because the mean of its divisors is an integer number (15524323707200).

Almost surely, 2^{866802636072681} is an apocalyptic number.

It is an amenable number.

866802636072681 is a deficient number, since it is larger than the sum of its proper divisors (623532439818519).

866802636072681 is a wasteful number, since it uses less digits than its factorization.

866802636072681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41687440 (or 41687415 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 69.

The spelling of 866802636072681 in words is "eight hundred sixty-six trillion, eight hundred two billion, six hundred thirty-six million, seventy-two thousand, six hundred eighty-one".