866965663 has 2 divisors, whose sum is σ = 866965664. Its totient is φ = 866965662.

The previous prime is 866965661. The next prime is 866965667. The reversal of 866965663 is 366569668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866965663 - 2¹ = 866965661 is a prime.

Together with 866965661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866965661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433482831 + 433482832.

It is an arithmetic number, because the mean of its divisors is an integer number (433482832).

Almost surely, 2^866965663 is an apocalyptic number.

866965663 is a deficient number, since it is larger than the sum of its proper divisors (1).

866965663 is an equidigital number, since it uses as much as digits as its factorization.

866965663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8398080, while the sum is 55.

The square root of 866965663 is about 29444.2806500685. The cubic root of 866965663 is about 953.5291312863.

The spelling of 866965663 in words is "eight hundred sixty-six million, nine hundred sixty-five thousand, six hundred sixty-three".