15545402400 has 432 divisors, whose sum is σ = 56105784000. Its totient is φ = 3735705600.

The previous prime is 15545402347. The next prime is 15545402401. The reversal of 15545402400 is 420454551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (15545402401) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 57789466 + ... + 57789734.

It is an arithmetic number, because the mean of its divisors is an integer number (129874500).

Almost surely, 2^15545402400 is an apocalyptic number.

15545402400 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 15545402400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28052892000).

15545402400 is an abundant number, since it is smaller than the sum of its proper divisors (40560381600).

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

15545402400 is a wasteful number, since it uses less digits than its factorization.

15545402400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 15545402400 its reverse (420454551), we get a palindrome (15965856951).

The spelling of 15545402400 in words is "fifteen billion, five hundred forty-five million, four hundred two thousand, four hundred".