16551444 has 96 divisors (see below), whose sum is σ = 49674240. Its totient is φ = 4169088.

The previous prime is 16551443. The next prime is 16551499. The reversal of 16551444 is 44415561.

16551444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24787 + ... + 25445.

It is an arithmetic number, because the mean of its divisors is an integer number (517440).

Almost surely, 2^16551444 is an apocalyptic number.

16551444 is a gapful number since it is divisible by the number (14) 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 16551444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24837120).

16551444 is an abundant number, since it is smaller than the sum of its proper divisors (33122796).

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

16551444 is a wasteful number, since it uses less digits than its factorization.

16551444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 707 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 16551444 is about 4068.3465929048. The cubic root of 16551444 is about 254.8464742917.

The spelling of 16551444 in words is "sixteen million, five hundred fifty-one thousand, four hundred forty-four".