666441203 has 4 divisors (see below), whose sum is σ = 666502728. Its totient is φ = 666379680.

The previous prime is 666441187. The next prime is 666441221. The reversal of 666441203 is 302144666.

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, and also an emirpimes, since its reverse is a distinct semiprime: 302144666 = 2 ⋅151072333.

It is a cyclic number.

It is not a de Polignac number, because 666441203 - 2⁴ = 666441187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666441203.

It is not an unprimeable number, because it can be changed into a prime (666441233) 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, 9713 + ... + 37778.

It is an arithmetic number, because the mean of its divisors is an integer number (166625682).

Almost surely, 2^666441203 is an apocalyptic number.

666441203 is a deficient number, since it is larger than the sum of its proper divisors (61525).

666441203 is a wasteful number, since it uses less digits than its factorization.

666441203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61524.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 666441203 is about 25815.5225203752. The cubic root of 666441203 is about 873.4819733050.

Adding to 666441203 its reverse (302144666), we get a palindrome (968585869).

The spelling of 666441203 in words is "six hundred sixty-six million, four hundred forty-one thousand, two hundred three".