15530721960 has 256 divisors, whose sum is σ = 53325941760. Its totient is φ = 3584655360.

The previous prime is 15530721953. The next prime is 15530722003. The reversal of 15530721960 is 6912703551.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8299825 + ... + 8301695.

It is an arithmetic number, because the mean of its divisors is an integer number (208304460).

Almost surely, 2^15530721960 is an apocalyptic number.

15530721960 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 15530721960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26662970880).

15530721960 is an abundant number, since it is smaller than the sum of its proper divisors (37795219800).

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

15530721960 is a wasteful number, since it uses less digits than its factorization.

15530721960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228 (or 2224 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 39.

The spelling of 15530721960 in words is "fifteen billion, five hundred thirty million, seven hundred twenty-one thousand, nine hundred sixty".