15550556100 has 144 divisors (see below), whose sum is σ = 46644389568. Its totient is φ = 3996725760.

The previous prime is 15550556093. The next prime is 15550556113. The reversal of 15550556100 is 165505551.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1181154 + ... + 1194246.

It is an arithmetic number, because the mean of its divisors is an integer number (323919372).

Almost surely, 2^15550556100 is an apocalyptic number.

15550556100 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 15550556100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23322194784).

15550556100 is an abundant number, since it is smaller than the sum of its proper divisors (31093833468).

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

15550556100 is a wasteful number, since it uses less digits than its factorization.

15550556100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13254 (or 13247 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 33.

The spelling of 15550556100 in words is "fifteen billion, five hundred fifty million, five hundred fifty-six thousand, one hundred".