16645201 has 4 divisors (see below), whose sum is σ = 16653492. Its totient is φ = 16636912.

The previous prime is 16645199. The next prime is 16645219. The reversal of 16645201 is 10254661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10890000 + 5755201 = 3300^2 + 2399^2 .

It is a cyclic number.

It is not a de Polignac number, because 16645201 - 2¹ = 16645199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16645271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975 + ... + 5851.

It is an arithmetic number, because the mean of its divisors is an integer number (4163373).

Almost surely, 2^16645201 is an apocalyptic number.

It is an amenable number.

16645201 is a deficient number, since it is larger than the sum of its proper divisors (8291).

16645201 is an equidigital number, since it uses as much as digits as its factorization.

16645201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8290.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 16645201 is about 4079.8530610795. The cubic root of 16645201 is about 255.3267680657.

Adding to 16645201 its reverse (10254661), we get a palindrome (26899862).

The spelling of 16645201 in words is "sixteen million, six hundred forty-five thousand, two hundred one".