16721318592 has 560 divisors, whose sum is σ = 58631620608. Its totient is φ = 4654817280.

The previous prime is 16721318591. The next prime is 16721318629. The reversal of 16721318592 is 29581312761.

16721318592 is a `hidden beast` number, since 1 + 6 + 7 + 21 + 31 + 8 + 592 = 666.

It is not an unprimeable number, because it can be changed into a prime (16721318591) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 45561993 + ... + 45562359.

Almost surely, 2^16721318592 is an apocalyptic number.

16721318592 is a gapful number since it is divisible by the number (12) 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 16721318592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29315810304).

16721318592 is an abundant number, since it is smaller than the sum of its proper divisors (41910302016).

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

16721318592 is a wasteful number, since it uses less digits than its factorization.

16721318592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 447 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 16721318592 in words is "sixteen billion, seven hundred twenty-one million, three hundred eighteen thousand, five hundred ninety-two".