868555666564 has 12 divisors (see below), whose sum is σ = 1520283347100. Its totient is φ = 434188995968.

The previous prime is 868555666487. The next prime is 868555666577. The reversal of 868555666564 is 465666555868.

868555666564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 367090574400 + 501465092164 = 605880^2 + 708142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 868555666493 and 868555666502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22187329 + ... + 22226440.

It is an arithmetic number, because the mean of its divisors is an integer number (126690278925).

Almost surely, 2^868555666564 is an apocalyptic number.

It is an amenable number.

868555666564 is a deficient number, since it is larger than the sum of its proper divisors (651727680536).

868555666564 is a wasteful number, since it uses less digits than its factorization.

868555666564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44418662 (or 44418660 counting only the distinct ones).

The product of its digits is 1244160000, while the sum is 70.

The spelling of 868555666564 in words is "eight hundred sixty-eight billion, five hundred fifty-five million, six hundred sixty-six thousand, five hundred sixty-four".