15444220000 has 120 divisors (see below), whose sum is σ = 41449788072. Its totient is φ = 5616000000.

The previous prime is 15444219991. The next prime is 15444220003. The reversal of 15444220000 is 2244451.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15444220003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 184900 + ... + 255100.

Almost surely, 2^15444220000 is an apocalyptic number.

15444220000 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 15444220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20724894036).

15444220000 is an abundant number, since it is smaller than the sum of its proper divisors (26005568072).

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

15444220000 is an equidigital number, since it uses as much as digits as its factorization.

15444220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70242 (or 70219 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 15444220000 its reverse (2244451), we get a palindrome (15446464451).

The spelling of 15444220000 in words is "fifteen billion, four hundred forty-four million, two hundred twenty thousand".