866189963 has 2 divisors, whose sum is σ = 866189964. Its totient is φ = 866189962.

The previous prime is 866189923. The next prime is 866189999. The reversal of 866189963 is 369981668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866189963 - 2⁸ = 866189707 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 866189899 and 866189908.

It is not a weakly prime, because it can be changed into another prime (866189923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433094981 + 433094982.

It is an arithmetic number, because the mean of its divisors is an integer number (433094982).

Almost surely, 2^866189963 is an apocalyptic number.

866189963 is a deficient number, since it is larger than the sum of its proper divisors (1).

866189963 is an equidigital number, since it uses as much as digits as its factorization.

866189963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 56.

The square root of 866189963 is about 29431.1053649026. The cubic root of 866189963 is about 953.2446627909.

The spelling of 866189963 in words is "eight hundred sixty-six million, one hundred eighty-nine thousand, nine hundred sixty-three".