16642201 has 8 divisors (see below), whose sum is σ = 18229320. Its totient is φ = 15122688.

The previous prime is 16642177. The next prime is 16642211. The reversal of 16642201 is 10224661.

It can be written as a sum of positive squares in 4 ways, for example, as 5593225 + 11048976 = 2365^2 + 3324^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-16642201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642211) 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, 16386 + ... + 17371.

It is an arithmetic number, because the mean of its divisors is an integer number (2278665).

Almost surely, 2^16642201 is an apocalyptic number.

It is an amenable number.

16642201 is a deficient number, since it is larger than the sum of its proper divisors (1587119).

16642201 is a wasteful number, since it uses less digits than its factorization.

16642201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33803.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 16642201 is about 4079.4853842121. The cubic root of 16642201 is about 255.3114277818.

Adding to 16642201 its reverse (10224661), we get a palindrome (26866862).

The spelling of 16642201 in words is "sixteen million, six hundred forty-two thousand, two hundred one".