866428663 has 4 divisors (see below), whose sum is σ = 866631880. Its totient is φ = 866225448.

The previous prime is 866428643. The next prime is 866428669. The reversal of 866428663 is 366824668.

It is a happy number.

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 866428663 - 2⁵ = 866428631 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 (866428669) 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, 95073 + ... + 103786.

It is an arithmetic number, because the mean of its divisors is an integer number (216657970).

Almost surely, 2^866428663 is an apocalyptic number.

866428663 is a deficient number, since it is larger than the sum of its proper divisors (203217).

866428663 is a wasteful number, since it uses less digits than its factorization.

866428663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203216.

The product of its digits is 1990656, while the sum is 49.

The square root of 866428663 is about 29435.1603189111. The cubic root of 866428663 is about 953.3322181050.

The spelling of 866428663 in words is "eight hundred sixty-six million, four hundred twenty-eight thousand, six hundred sixty-three".