15534400120 has 32 divisors (see below), whose sum is σ = 35161711200. Its totient is φ = 6176549248.

The previous prime is 15534400109. The next prime is 15534400127. The reversal of 15534400120 is 2100443551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15534400127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156075 + ... + 1169434.

It is an arithmetic number, because the mean of its divisors is an integer number (1098803475).

Almost surely, 2^15534400120 is an apocalyptic number.

15534400120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15534400120 is an abundant number, since it is smaller than the sum of its proper divisors (19627311080).

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

15534400120 is a wasteful number, since it uses less digits than its factorization.

15534400120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325687 (or 2325683 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 15534400120 its reverse (2100443551), we get a palindrome (17634843671).

The spelling of 15534400120 in words is "fifteen billion, five hundred thirty-four million, four hundred thousand, one hundred twenty".