15998591394 has 160 divisors (see below), whose sum is σ = 39428769600. Its totient is φ = 4830295680.

The previous prime is 15998591363. The next prime is 15998591417. The reversal of 15998591394 is 49319589951.

15998591394 is a `hidden beast` number, since 1 + 5 + 9 + 9 + 8 + 591 + 39 + 4 = 666.

15998591394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 79 ways as a sum of consecutive naturals, for example, 6718084 + ... + 6720464.

It is an arithmetic number, because the mean of its divisors is an integer number (246429810).

Almost surely, 2^15998591394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15998591394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19714384800).

15998591394 is an abundant number, since it is smaller than the sum of its proper divisors (23430178206).

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

15998591394 is a wasteful number, since it uses less digits than its factorization.

15998591394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510 (or 2501 counting only the distinct ones).

The product of its digits is 15746400, while the sum is 63.

The spelling of 15998591394 in words is "fifteen billion, nine hundred ninety-eight million, five hundred ninety-one thousand, three hundred ninety-four".