16349921280 has 800 divisors, whose sum is σ = 73081483200. Its totient is φ = 3397386240.

The previous prime is 16349921279. The next prime is 16349921311. The reversal of 16349921280 is 8212994361.

16349921280 is a `hidden beast` number, since 1 + 6 + 349 + 9 + 21 + 280 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1486356475 + ... + 1486356485.

It is an arithmetic number, because the mean of its divisors is an integer number (91351854).

Almost surely, 2^16349921280 is an apocalyptic number.

16349921280 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 16349921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36540741600).

16349921280 is an abundant number, since it is smaller than the sum of its proper divisors (56731561920).

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

16349921280 is an frugal number, since it uses more digits than its factorization.

16349921280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 16349921280 in words is "sixteen billion, three hundred forty-nine million, nine hundred twenty-one thousand, two hundred eighty".