15551231400 has 144 divisors (see below), whose sum is σ = 52305982560. Its totient is φ = 4140662400.

The previous prime is 15551231363. The next prime is 15551231401. The reversal of 15551231400 is 413215551.

15551231400 is a `hidden beast` number, since 1 + 5 + 5 + 512 + 3 + 140 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (15551231401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1237549 + ... + 1250051.

It is an arithmetic number, because the mean of its divisors is an integer number (363235990).

Almost surely, 2^15551231400 is an apocalyptic number.

15551231400 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 15551231400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26152991280).

15551231400 is an abundant number, since it is smaller than the sum of its proper divisors (36754751160).

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

15551231400 is a wasteful number, since it uses less digits than its factorization.

15551231400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13216 (or 13204 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 15551231400 its reverse (413215551), we get a palindrome (15964446951).

The spelling of 15551231400 in words is "fifteen billion, five hundred fifty-one million, two hundred thirty-one thousand, four hundred".