18563211228 has 48 divisors (see below), whose sum is σ = 44887812480. Its totient is φ = 5963692224.

The previous prime is 18563211221. The next prime is 18563211229. The reversal of 18563211228 is 82211236581.

It is a super-2 number, since 2×18563211228² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18563211221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148551 + ... + 243297.

It is an arithmetic number, because the mean of its divisors is an integer number (935162760).

Almost surely, 2^18563211228 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 18563211228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22443906240).

18563211228 is an abundant number, since it is smaller than the sum of its proper divisors (26324601252).

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

18563211228 is a wasteful number, since it uses less digits than its factorization.

18563211228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95346 (or 95344 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The spelling of 18563211228 in words is "eighteen billion, five hundred sixty-three million, two hundred eleven thousand, two hundred twenty-eight".