866802655166533 has 4 divisors (see below), whose sum is σ = 872323691186860. Its totient is φ = 861281619146208.

The previous prime is 866802655166519. The next prime is 866802655166537. The reversal of 866802655166533 is 335661556208668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 606243721148289 + 260558934018244 = 24622017^2 + 16141838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866802655166533 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 (866802655166537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2760518009928 + ... + 2760518010241.

It is an arithmetic number, because the mean of its divisors is an integer number (218080922796715).

Almost surely, 2^{866802655166533} is an apocalyptic number.

It is an amenable number.

866802655166533 is a deficient number, since it is larger than the sum of its proper divisors (5521036020327).

866802655166533 is a wasteful number, since it uses less digits than its factorization.

866802655166533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521036020326.

The product of its (nonzero) digits is 1119744000, while the sum is 70.

The spelling of 866802655166533 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-three".