15540000000 has 576 divisors, whose sum is σ = 60681094656. Its totient is φ = 3456000000.

The previous prime is 15539999987. The next prime is 15540000011. The reversal of 15540000000 is 4551.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a zygodrome in base 5.

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 3700 × 3500 × 1200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 419999982 + ... + 420000018.

Almost surely, 2^15540000000 is an apocalyptic number.

15540000000 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 15540000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30340547328).

15540000000 is an abundant number, since it is smaller than the sum of its proper divisors (45141094656).

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

15540000000 is an frugal number, since it uses more digits than its factorization.

15540000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

Adding to 15540000000 its reverse (4551), we get a palindrome (15540004551).

It can be divided in two parts, 15 and 540000000, that multiplied together give a 4-th power (8100000000 = 300⁴).

The spelling of 15540000000 in words is "fifteen billion, five hundred forty million", and thus it is an aban number.