15561033400 has 96 divisors (see below), whose sum is σ = 40431318480. Its totient is φ = 5520512000.

The previous prime is 15561033377. The next prime is 15561033409. The reversal of 15561033400 is 433016551.

15561033400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561033409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3942 + ... + 176458.

Almost surely, 2^15561033400 is an apocalyptic number.

15561033400 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 15561033400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20215659240).

15561033400 is an abundant number, since it is smaller than the sum of its proper divisors (24870285080).

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

15561033400 is a wasteful number, since it uses less digits than its factorization.

15561033400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172585 (or 172576 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 15561033400 its reverse (433016551), we get a palindrome (15994049951).

The spelling of 15561033400 in words is "fifteen billion, five hundred sixty-one million, thirty-three thousand, four hundred".