863917663 has 4 divisors (see below), whose sum is σ = 987334480. Its totient is φ = 740500848.

The previous prime is 863917661. The next prime is 863917709. The reversal of 863917663 is 366719368.

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 863917663 - 2¹ = 863917661 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 (863917661) 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, 61708398 + ... + 61708411.

It is an arithmetic number, because the mean of its divisors is an integer number (246833620).

Almost surely, 2^863917663 is an apocalyptic number.

863917663 is a deficient number, since it is larger than the sum of its proper divisors (123416817).

863917663 is a wasteful number, since it uses less digits than its factorization.

863917663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123416816.

The product of its digits is 979776, while the sum is 49.

The square root of 863917663 is about 29392.4762992164. The cubic root of 863917663 is about 952.4103751641.

The spelling of 863917663 in words is "eight hundred sixty-three million, nine hundred seventeen thousand, six hundred sixty-three".