16557664 has 48 divisors (see below), whose sum is σ = 34760880. Its totient is φ = 7741440.

The previous prime is 16557661. The next prime is 16557707. The reversal of 16557664 is 46675561.

16557664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68584 + ... + 68824.

It is an arithmetic number, because the mean of its divisors is an integer number (724185).

Almost surely, 2^16557664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16557664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17380440).

16557664 is an abundant number, since it is smaller than the sum of its proper divisors (18203216).

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

16557664 is a wasteful number, since it uses less digits than its factorization.

16557664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 375 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 16557664 is about 4069.1109594112. The cubic root of 16557664 is about 254.8783938944.

The spelling of 16557664 in words is "sixteen million, five hundred fifty-seven thousand, six hundred sixty-four".