15506538320 has 160 divisors (see below), whose sum is σ = 44658475008. Its totient is φ = 4875945984.

The previous prime is 15506538301. The next prime is 15506538361. The reversal of 15506538320 is 2383560551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1136177 + ... + 1149743.

Almost surely, 2^15506538320 is an apocalyptic number.

15506538320 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 15506538320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22329237504).

15506538320 is an abundant number, since it is smaller than the sum of its proper divisors (29151936688).

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

15506538320 is a wasteful number, since it uses less digits than its factorization.

15506538320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13757 (or 13751 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 15506538320 in words is "fifteen billion, five hundred six million, five hundred thirty-eight thousand, three hundred twenty".