16644441220 has 48 divisors (see below), whose sum is σ = 38468400768. Its totient is φ = 5998952960.

The previous prime is 16644441217. The next prime is 16644441241. The reversal of 16644441220 is 2214444661.

It is a super-3 number, since 3×16644441220³ (a number of 32 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 309904 + ... + 359623.

It is an arithmetic number, because the mean of its divisors is an integer number (801425016).

Almost surely, 2^16644441220 is an apocalyptic number.

16644441220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16644441220 is an abundant number, since it is smaller than the sum of its proper divisors (21823959548).

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

16644441220 is a wasteful number, since it uses less digits than its factorization.

16644441220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669660 (or 669658 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

Adding to 16644441220 its reverse (2214444661), we get a palindrome (18858885881).

It can be divided in two parts, 16644441 and 220, that added together give a palindrome (16644661).

The spelling of 16644441220 in words is "sixteen billion, six hundred forty-four million, four hundred forty-one thousand, two hundred twenty".