16662201 has 4 divisors (see below), whose sum is σ = 22216272. Its totient is φ = 11108132.

The previous prime is 16662197. The next prime is 16662203. The reversal of 16662201 is 10226661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10226661 = 3 ⋅3408887.

It is a cyclic number.

It is not a de Polignac number, because 16662201 - 2² = 16662197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16662203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2777031 + ... + 2777036.

It is an arithmetic number, because the mean of its divisors is an integer number (5554068).

Almost surely, 2^16662201 is an apocalyptic number.

It is an amenable number.

16662201 is a deficient number, since it is larger than the sum of its proper divisors (5554071).

16662201 is an equidigital number, since it uses as much as digits as its factorization.

16662201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554070.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 16662201 is about 4081.9359377629. The cubic root of 16662201 is about 255.4136615434.

Adding to 16662201 its reverse (10226661), we get a palindrome (26888862).

The spelling of 16662201 in words is "sixteen million, six hundred sixty-two thousand, two hundred one".