866121053875 has 288 divisors, whose sum is σ = 1510587187200. Its totient is φ = 488881008000.

The previous prime is 866121053821. The next prime is 866121053909. The reversal of 866121053875 is 578350121668.

It is not a de Polignac number, because 866121053875 - 2¹⁹ = 866120529587 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 677185486 + ... + 677186764.

It is an arithmetic number, because the mean of its divisors is an integer number (5245094400).

Almost surely, 2^866121053875 is an apocalyptic number.

866121053875 is a deficient number, since it is larger than the sum of its proper divisors (644466133325).

866121053875 is a wasteful number, since it uses less digits than its factorization.

866121053875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 866121053875 in words is "eight hundred sixty-six billion, one hundred twenty-one million, fifty-three thousand, eight hundred seventy-five".