15555540000 has 1440 divisors, whose sum is σ = 71617525056. Its totient is φ = 2903040000.

The previous prime is 15555539977. The next prime is 15555540031. The reversal of 15555540000 is 4555551.

15555540000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 15555540000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 420419982 + ... + 420420018.

Almost surely, 2^15555540000 is an apocalyptic number.

15555540000 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 15555540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35808762528).

15555540000 is an abundant number, since it is smaller than the sum of its proper divisors (56061985056).

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

15555540000 is a wasteful number, since it uses less digits than its factorization.

15555540000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 30.

It can be divided in two parts, 15555 and 540000, that added together give a palindrome (555555).

The spelling of 15555540000 in words is "fifteen billion, five hundred fifty-five million, five hundred forty thousand".