866188229 has 4 divisors (see below), whose sum is σ = 874135020. Its totient is φ = 858241440.

The previous prime is 866188201. The next prime is 866188231. The reversal of 866188229 is 922881668.

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

It can be written as a sum of positive squares in 2 ways, for example, as 619761025 + 246427204 = 24895^2 + 15698^2 .

It is a cyclic number.

It is not a de Polignac number, because 866188229 - 2¹⁶ = 866122693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866788229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3973232 + ... + 3973449.

It is an arithmetic number, because the mean of its divisors is an integer number (218533755).

Almost surely, 2^866188229 is an apocalyptic number.

It is an amenable number.

866188229 is a deficient number, since it is larger than the sum of its proper divisors (7946791).

866188229 is a wasteful number, since it uses less digits than its factorization.

866188229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7946790.

The product of its digits is 663552, while the sum is 50.

The square root of 866188229 is about 29431.0759062594. The cubic root of 866188229 is about 953.2440266997.

The spelling of 866188229 in words is "eight hundred sixty-six million, one hundred eighty-eight thousand, two hundred twenty-nine".