866555441 has 4 divisors (see below), whose sum is σ = 876995952. Its totient is φ = 856114932.

The previous prime is 866555381. The next prime is 866555449. The reversal of 866555441 is 144555668.

866555441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866555441 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 866555392 and 866555401.

It is not an unprimeable number, because it can be changed into a prime (866555449) 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, 5220131 + ... + 5220296.

It is an arithmetic number, because the mean of its divisors is an integer number (219248988).

Almost surely, 2^866555441 is an apocalyptic number.

It is an amenable number.

866555441 is a deficient number, since it is larger than the sum of its proper divisors (10440511).

866555441 is a wasteful number, since it uses less digits than its factorization.

866555441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440510.

The product of its digits is 576000, while the sum is 44.

The square root of 866555441 is about 29437.3137531263. The cubic root of 866555441 is about 953.3787138188.

The spelling of 866555441 in words is "eight hundred sixty-six million, five hundred fifty-five thousand, four hundred forty-one".