16005991680 has 432 divisors, whose sum is σ = 64180945920. Its totient is φ = 3607068672.

The previous prime is 16005991637. The next prime is 16005991693. The reversal of 16005991680 is 8619950061.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5885361 + ... + 5888079.

Almost surely, 2^16005991680 is an apocalyptic number.

16005991680 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 16005991680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32090472960).

16005991680 is an abundant number, since it is smaller than the sum of its proper divisors (48174954240).

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

16005991680 is a wasteful number, since it uses less digits than its factorization.

16005991680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2826 (or 2809 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 16005991680 in words is "sixteen billion, five million, nine hundred ninety-one thousand, six hundred eighty".