866802655166535 has 40 divisors (see below), whose sum is σ = 1554488331842160. Its totient is φ = 462097102594176.

The previous prime is 866802655166519. The next prime is 866802655166537. The reversal of 866802655166535 is 535661556208668.

866802655166535 is a `hidden beast` number, since 8 + 6 + 6 + 8 + 0 + 2 + 6 + 551 + 6 + 65 + 3 + 5 = 666.

It is not a de Polignac number, because 866802655166535 - 2⁴ = 866802655166519 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866802655166537) 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 39 ways as a sum of consecutive naturals, for example, 456567342 + ... + 458461931.

It is an arithmetic number, because the mean of its divisors is an integer number (38862208296054).

Almost surely, 2^{866802655166535} is an apocalyptic number.

866802655166535 is a deficient number, since it is larger than the sum of its proper divisors (687685676675625).

866802655166535 is a wasteful number, since it uses less digits than its factorization.

866802655166535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915031629 (or 915031620 counting only the distinct ones).

The product of its (nonzero) digits is 1866240000, while the sum is 72.

The spelling of 866802655166535 in words is "eight hundred sixty-six trillion, eight hundred two billion, six hundred fifty-five million, one hundred sixty-six thousand, five hundred thirty-five".