866825138665233 has 80 divisors (see below), whose sum is σ = 1425137256645696. Its totient is φ = 520687625794560.

The previous prime is 866825138665217. The next prime is 866825138665247. The reversal of 866825138665233 is 332566831528668.

866825138665233 is a `hidden beast` number, since 8 + 6 + 6 + 8 + 2 + 5 + 1 + 38 + 66 + 523 + 3 = 666.

It is not a de Polignac number, because 866825138665233 - 2⁴ = 866825138665217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866825138665033) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6715189510 + ... + 6715318592.

Almost surely, 2^{866825138665233} is an apocalyptic number.

It is an amenable number.

866825138665233 is a deficient number, since it is larger than the sum of its proper divisors (558312117980463).

866825138665233 is a wasteful number, since it uses less digits than its factorization.

866825138665233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195916 (or 195907 counting only the distinct ones).

The product of its digits is 1791590400, while the sum is 72.

The spelling of 866825138665233 in words is "eight hundred sixty-six trillion, eight hundred twenty-five billion, one hundred thirty-eight million, six hundred sixty-five thousand, two hundred thirty-three".