866504447 has 4 divisors (see below), whose sum is σ = 868400976. Its totient is φ = 864607920.

The previous prime is 866504437. The next prime is 866504521. The reversal of 866504447 is 744405668.

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

It is a cyclic number.

It is not a de Polignac number, because 866504447 - 2¹⁸ = 866242303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 866504398 and 866504407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866504417) 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, 947579 + ... + 948492.

It is an arithmetic number, because the mean of its divisors is an integer number (217100244).

Almost surely, 2^866504447 is an apocalyptic number.

866504447 is a deficient number, since it is larger than the sum of its proper divisors (1896529).

866504447 is a wasteful number, since it uses less digits than its factorization.

866504447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896528.

The product of its (nonzero) digits is 645120, while the sum is 44.

The square root of 866504447 is about 29436.4475947761. The cubic root of 866504447 is about 953.3600123619.

The spelling of 866504447 in words is "eight hundred sixty-six million, five hundred four thousand, four hundred forty-seven".