16662241 has 2 divisors, whose sum is σ = 16662242. Its totient is φ = 16662240.

The previous prime is 16662229. The next prime is 16662263. The reversal of 16662241 is 14226661.

16662241 is nontrivially palindromic in base 15.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 5271616 = 3375^2 + 2296^2 .

It is an emirp because it is prime and its reverse (14226661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16662241 - 2¹³ = 16654049 is a prime.

It is not a weakly prime, because it can be changed into another prime (16662271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331120 + 8331121.

It is an arithmetic number, because the mean of its divisors is an integer number (8331121).

Almost surely, 2^16662241 is an apocalyptic number.

It is an amenable number.

16662241 is a deficient number, since it is larger than the sum of its proper divisors (1).

16662241 is an equidigital number, since it uses as much as digits as its factorization.

16662241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 16662241 is about 4081.9408373959. The cubic root of 16662241 is about 255.4138659289.

It can be divided in two parts, 1666224 and 1, that added together give a triangular number (1666225 = T₁₈₂₅).

The spelling of 16662241 in words is "sixteen million, six hundred sixty-two thousand, two hundred forty-one".