866845663 has 2 divisors, whose sum is σ = 866845664. Its totient is φ = 866845662.

The previous prime is 866845619. The next prime is 866845709. The reversal of 866845663 is 366548668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866845663 - 2¹³ = 866837471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866845663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866845363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433422831 + 433422832.

It is an arithmetic number, because the mean of its divisors is an integer number (433422832).

Almost surely, 2^866845663 is an apocalyptic number.

866845663 is a deficient number, since it is larger than the sum of its proper divisors (1).

866845663 is an equidigital number, since it uses as much as digits as its factorization.

866845663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 52.

The square root of 866845663 is about 29442.2428323659. The cubic root of 866845663 is about 953.4851353973.

The spelling of 866845663 in words is "eight hundred sixty-six million, eight hundred forty-five thousand, six hundred sixty-three".