866478383466520 has 32 divisors (see below), whose sum is σ = 2126810577600720. Its totient is φ = 315083048533120.

The previous prime is 866478383466511. The next prime is 866478383466539. The reversal of 866478383466520 is 25664383874668.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 984634526227 + ... + 984634527106.

Almost surely, 2^{866478383466520} is an apocalyptic number.

It is an amenable number.

866478383466520 is an abundant number, since it is smaller than the sum of its proper divisors (1260332194134200).

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

866478383466520 is a wasteful number, since it uses less digits than its factorization.

866478383466520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969269053355 (or 1969269053351 counting only the distinct ones).

The product of its (nonzero) digits is 6688604160, while the sum is 76.

The spelling of 866478383466520 in words is "eight hundred sixty-six trillion, four hundred seventy-eight billion, three hundred eighty-three million, four hundred sixty-six thousand, five hundred twenty".