16557201 has 12 divisors (see below), whose sum is σ = 25323012. Its totient is φ = 10388736.

The previous prime is 16557199. The next prime is 16557223. The reversal of 16557201 is 10275561.

16557201 is a `hidden beast` number, since 1 + 655 + 7 + 2 + 0 + 1 = 666.

16557201 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 can be written as a sum of positive squares in 2 ways, for example, as 7700625 + 8856576 = 2775^2 + 2976^2 .

It is not a de Polignac number, because 16557201 - 2¹ = 16557199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16557001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53956 + ... + 54261.

It is an arithmetic number, because the mean of its divisors is an integer number (2110251).

Almost surely, 2^16557201 is an apocalyptic number.

It is an amenable number.

16557201 is a deficient number, since it is larger than the sum of its proper divisors (8765811).

16557201 is a wasteful number, since it uses less digits than its factorization.

16557201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108240 (or 108237 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 16557201 is about 4069.0540669792. The cubic root of 16557201 is about 254.8760181608.

The spelling of 16557201 in words is "sixteen million, five hundred fifty-seven thousand, two hundred one".