665716003 has 2 divisors, whose sum is σ = 665716004. Its totient is φ = 665716002.

The previous prime is 665716001. The next prime is 665716019. The reversal of 665716003 is 300617566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665716003 - 2¹ = 665716001 is a prime.

Together with 665716001, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665716003.

It is not a weakly prime, because it can be changed into another prime (665716001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332858001 + 332858002.

It is an arithmetic number, because the mean of its divisors is an integer number (332858002).

Almost surely, 2^665716003 is an apocalyptic number.

665716003 is a deficient number, since it is larger than the sum of its proper divisors (1).

665716003 is an equidigital number, since it uses as much as digits as its factorization.

665716003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 665716003 is about 25801.4728843142. The cubic root of 665716003 is about 873.1650265988.

The spelling of 665716003 in words is "six hundred sixty-five million, seven hundred sixteen thousand, three".