868663550 has 12 divisors (see below), whose sum is σ = 1615714296. Its totient is φ = 347465400.

The previous prime is 868663531. The next prime is 868663559. The reversal of 868663550 is 55366868.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 868663495 and 868663504.

It is a congruent 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 (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8686586 + ... + 8686685.

It is an arithmetic number, because the mean of its divisors is an integer number (134642858).

Almost surely, 2^868663550 is an apocalyptic number.

868663550 is a deficient number, since it is larger than the sum of its proper divisors (747050746).

868663550 is a wasteful number, since it uses less digits than its factorization.

868663550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17373283 (or 17373278 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The square root of 868663550 is about 29473.0987512341. The cubic root of 868663550 is about 954.1511970524.

The spelling of 868663550 in words is "eight hundred sixty-eight million, six hundred sixty-three thousand, five hundred fifty".