15995561568 has 288 divisors, whose sum is σ = 50408332128. Its totient is φ = 4425523200.

The previous prime is 15995561551. The next prime is 15995561591. The reversal of 15995561568 is 86516559951.

15995561568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 47 ways as a sum of consecutive naturals, for example, 37993998 + ... + 37994418.

It is an arithmetic number, because the mean of its divisors is an integer number (175028931).

Almost surely, 2^15995561568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15995561568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25204166064).

15995561568 is an abundant number, since it is smaller than the sum of its proper divisors (34412770560).

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

15995561568 is a wasteful number, since it uses less digits than its factorization.

15995561568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686 (or 671 counting only the distinct ones).

The product of its digits is 14580000, while the sum is 60.

The spelling of 15995561568 in words is "fifteen billion, nine hundred ninety-five million, five hundred sixty-one thousand, five hundred sixty-eight".