16066638 has 48 divisors (see below), whose sum is σ = 41165280. Its totient is φ = 4431168.

The previous prime is 16066619. The next prime is 16066639. The reversal of 16066638 is 83666061.

16066638 is digitally balanced in base 2 and base 4, because in such bases 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 (16066639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1456 + ... + 5852.

It is an arithmetic number, because the mean of its divisors is an integer number (857610).

Almost surely, 2^16066638 is an apocalyptic number.

16066638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16066638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20582640).

16066638 is an abundant number, since it is smaller than the sum of its proper divisors (25098642).

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

16066638 is a wasteful number, since it uses less digits than its factorization.

16066638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4438 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 16066638 is about 4008.3210949224. The cubic root of 16066638 is about 252.3335530157. Note that the first 3 decimals are identical.

The spelling of 16066638 in words is "sixteen million, sixty-six thousand, six hundred thirty-eight".