15551224000 has 112 divisors (see below), whose sum is σ = 41475391776. Its totient is φ = 5741952000.

The previous prime is 15551223901. The next prime is 15551224043. The reversal of 15551224000 is 42215551.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29235 + ... + 178765.

It is an arithmetic number, because the mean of its divisors is an integer number (370315998).

Almost surely, 2^15551224000 is an apocalyptic number.

15551224000 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 15551224000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20737695888).

15551224000 is an abundant number, since it is smaller than the sum of its proper divisors (25924167776).

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

15551224000 is a wasteful number, since it uses less digits than its factorization.

15551224000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149571 (or 149551 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 15551224000 its reverse (42215551), we get a palindrome (15593439551).

The spelling of 15551224000 in words is "fifteen billion, five hundred fifty-one million, two hundred twenty-four thousand".