15601551600 has 120 divisors (see below), whose sum is σ = 50312962800. Its totient is φ = 4132444160.

The previous prime is 15601551547. The next prime is 15601551611. The reversal of 15601551600 is 615510651.

15601551600 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

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

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 23 ways as a sum of consecutive naturals, for example, 135172 + ... + 222428.

It is an arithmetic number, because the mean of its divisors is an integer number (419274690).

Almost surely, 2^15601551600 is an apocalyptic number.

15601551600 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 15601551600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25156481400).

15601551600 is an abundant number, since it is smaller than the sum of its proper divisors (34711411200).

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

15601551600 is a wasteful number, since it uses less digits than its factorization.

15601551600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87427 (or 87416 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 15601551600 in words is "fifteen billion, six hundred one million, five hundred fifty-one thousand, six hundred".