655808868 has 216 divisors, whose sum is σ = 2021781944. Its totient is φ = 177914880.

The previous prime is 655808849. The next prime is 655808869. The reversal of 655808868 is 868808556.

655808868 is a `hidden beast` number, since 6 + 558 + 0 + 8 + 86 + 8 = 666.

655808868 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 4 ways, for example, as 3415104 + 652393764 = 1848^2 + 25542^2 .

It is a super-4 number, since 4×655808868⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (655808869) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2095080 + ... + 2095392.

Almost surely, 2^655808868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655808868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010890972).

655808868 is an abundant number, since it is smaller than the sum of its proper divisors (1365973076).

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

655808868 is a wasteful number, since it uses less digits than its factorization.

655808868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 54.

The square root of 655808868 is about 25608.7654524774. The cubic root of 655808868 is about 868.8119018190.

The spelling of 655808868 in words is "six hundred fifty-five million, eight hundred eight thousand, eight hundred sixty-eight".