12218614544 has 80 divisors (see below), whose sum is σ = 27295574400. Its totient is φ = 5259405312.

The previous prime is 12218614523. The next prime is 12218614547. The reversal of 12218614544 is 44541681221.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 12218614498 and 12218614507.

It is not an unprimeable number, because it can be changed into a prime (12218614547) 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, 109109 + ... + 190635.

It is an arithmetic number, because the mean of its divisors is an integer number (341194680).

Almost surely, 2^12218614544 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 12218614544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13647787200).

12218614544 is an abundant number, since it is smaller than the sum of its proper divisors (15076959856).

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

12218614544 is a wasteful number, since it uses less digits than its factorization.

12218614544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81600 (or 81594 counting only the distinct ones).

The product of its digits is 61440, while the sum is 38.

The spelling of 12218614544 in words is "twelve billion, two hundred eighteen million, six hundred fourteen thousand, five hundred forty-four".