15505625520 has 480 divisors, whose sum is σ = 66685731840. Its totient is φ = 3134453760.

The previous prime is 15505625501. The next prime is 15505625533. The reversal of 15505625520 is 2552650551.

15505625520 is a `hidden beast` number, since 1 + 5 + 5 + 0 + 5 + 625 + 5 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2047501 + ... + 2055059.

It is an arithmetic number, because the mean of its divisors is an integer number (138928608).

Almost surely, 2^15505625520 is an apocalyptic number.

15505625520 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 15505625520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33342865920).

15505625520 is an abundant number, since it is smaller than the sum of its proper divisors (51180106320).

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

15505625520 is a wasteful number, since it uses less digits than its factorization.

15505625520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7633 (or 7624 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 15505625520 in words is "fifteen billion, five hundred five million, six hundred twenty-five thousand, five hundred twenty".