16445673220 has 48 divisors (see below), whose sum is σ = 35765498160. Its totient is φ = 6344554496.

The previous prime is 16445673217. The next prime is 16445673247. The reversal of 16445673220 is 2237654461.

It can be written as a sum of positive squares in 8 ways, for example, as 759112704 + 15686560516 = 27552^2 + 125246^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537864 + ... + 567616.

It is an arithmetic number, because the mean of its divisors is an integer number (745114545).

Almost surely, 2^16445673220 is an apocalyptic number.

16445673220 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 16445673220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17882749080).

16445673220 is an abundant number, since it is smaller than the sum of its proper divisors (19319824940).

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

16445673220 is a wasteful number, since it uses less digits than its factorization.

16445673220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30744 (or 30742 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 16445673220 in words is "sixteen billion, four hundred forty-five million, six hundred seventy-three thousand, two hundred twenty".