13163643220 has 108 divisors (see below), whose sum is σ = 34821223164. Its totient is φ = 4166023680.

The previous prime is 13163643203. The next prime is 13163643271. The reversal of 13163643220 is 2234636131.

It can be written as a sum of positive squares in 6 ways, for example, as 2655753156 + 10507890064 = 51534^2 + 102508^2 .

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 125880 + ... + 205360.

It is an arithmetic number, because the mean of its divisors is an integer number (322418733).

Almost surely, 2^13163643220 is an apocalyptic number.

13163643220 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 13163643220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17410611582).

13163643220 is an abundant number, since it is smaller than the sum of its proper divisors (21657579944).

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

13163643220 is a wasteful number, since it uses less digits than its factorization.

13163643220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79530 (or 79508 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 31.

The spelling of 13163643220 in words is "thirteen billion, one hundred sixty-three million, six hundred forty-three thousand, two hundred twenty".