15501000000 has 196 divisors, whose sum is σ = 51275593664. Its totient is φ = 4132800000.

The previous prime is 15500999999. The next prime is 15501000019. The reversal of 15501000000 is 10551.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 15501000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2997417 + ... + 3002583.

Almost surely, 2^15501000000 is an apocalyptic number.

15501000000 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 15501000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25637796832).

15501000000 is an abundant number, since it is smaller than the sum of its proper divisors (35774593664).

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

15501000000 is an frugal number, since it uses more digits than its factorization.

15501000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212 (or 5177 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 12.

Adding to 15501000000 its reverse (10551), we get a palindrome (15501010551).

The spelling of 15501000000 in words is "fifteen billion, five hundred one million", and thus it is an aban number.