163568618820 has 216 divisors, whose sum is σ = 529065318600. Its totient is φ = 40896405504.

The previous prime is 163568618779. The next prime is 163568618827. The reversal of 163568618820 is 28816865361.

163568618820 is a `hidden beast` number, since 1 + 63 + 568 + 6 + 18 + 8 + 2 + 0 = 666.

163568618820 is digitally balanced in base 3, 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 12 ways, for example, as 1172514564 + 162396104256 = 34242^2 + 402984^2 .

It is not an unprimeable number, because it can be changed into a prime (163568618827) 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, 13987536 + ... + 13999224.

It is an arithmetic number, because the mean of its divisors is an integer number (2449376475).

Almost surely, 2^163568618820 is an apocalyptic number.

163568618820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163568618820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264532659300).

163568618820 is an abundant number, since it is smaller than the sum of its proper divisors (365496699780).

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

163568618820 is a wasteful number, since it uses less digits than its factorization.

163568618820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12007 (or 11985 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 163568618820 in words is "one hundred sixty-three billion, five hundred sixty-eight million, six hundred eighteen thousand, eight hundred twenty".