16557668 has 6 divisors (see below), whose sum is σ = 28975926. Its totient is φ = 8278832.

The previous prime is 16557661. The next prime is 16557707. The reversal of 16557668 is 86675561.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 4502884 = 3472^2 + 2122^2 .

It is a nialpdrome in base 16.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069705 + ... + 2069712.

It is an arithmetic number, because the mean of its divisors is an integer number (4829321).

Almost surely, 2^16557668 is an apocalyptic number.

It is an amenable number.

16557668 is a deficient number, since it is larger than the sum of its proper divisors (12418258).

16557668 is a wasteful number, since it uses less digits than its factorization.

16557668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139421 (or 4139419 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The square root of 16557668 is about 4069.1114509190. Note that the first 3 decimals coincide. The cubic root of 16557668 is about 254.8784144189.

The spelling of 16557668 in words is "sixteen million, five hundred fifty-seven thousand, six hundred sixty-eight".