868663555 has 8 divisors (see below), whose sum is σ = 1076022144. Its totient is φ = 672513600.

The previous prime is 868663531. The next prime is 868663559. The reversal of 868663555 is 555366868.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 868663555 - 2¹⁵ = 868630787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (868663559) 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 7 ways as a sum of consecutive naturals, for example, 2801986 + ... + 2802295.

It is an arithmetic number, because the mean of its divisors is an integer number (134502768).

Almost surely, 2^868663555 is an apocalyptic number.

868663555 is a deficient number, since it is larger than the sum of its proper divisors (207358589).

868663555 is a wasteful number, since it uses less digits than its factorization.

868663555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5604317.

The product of its digits is 5184000, while the sum is 52.

The square root of 868663555 is about 29473.0988360573. The cubic root of 868663555 is about 954.1511988831.

The spelling of 868663555 in words is "eight hundred sixty-eight million, six hundred sixty-three thousand, five hundred fifty-five".