863666568 has 24 divisors (see below), whose sum is σ = 2339097150. Its totient is φ = 287888832.

The previous prime is 863666561. The next prime is 863666611. The reversal of 863666568 is 865666368.

It can be written as a sum of positive squares in only one way, i.e., 824953284 + 38713284 = 28722^2 + 6222^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (863666561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5997613 + ... + 5997756.

Almost surely, 2^863666568 is an apocalyptic number.

It is an amenable number.

863666568 is an abundant number, since it is smaller than the sum of its proper divisors (1475430582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

863666568 is a wasteful number, since it uses less digits than its factorization.

863666568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11995381 (or 11995374 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 863666568 is about 29388.2045725832. The cubic root of 863666568 is about 952.3180945121.

The spelling of 863666568 in words is "eight hundred sixty-three million, six hundred sixty-six thousand, five hundred sixty-eight".