15538500000 has 336 divisors, whose sum is σ = 56699274240. Its totient is φ = 4140000000.

The previous prime is 15538499989. The next prime is 15538500017. The reversal of 15538500000 is 583551.

15538500000 is a `hidden beast` number, since 155 + 3 + 8 + 500 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 13499425 + ... + 13500575.

It is an arithmetic number, because the mean of its divisors is an integer number (168747840).

Almost surely, 2^15538500000 is an apocalyptic number.

15538500000 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 15538500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28349637120).

15538500000 is an abundant number, since it is smaller than the sum of its proper divisors (41160774240).

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

15538500000 is an frugal number, since it uses more digits than its factorization.

15538500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 15538500000 in words is "fifteen billion, five hundred thirty-eight million, five hundred thousand".