665218303 has 2 divisors, whose sum is σ = 665218304. Its totient is φ = 665218302.

The previous prime is 665218249. The next prime is 665218321. The reversal of 665218303 is 303812566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665218303 - 2²⁵ = 631663871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665218363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332609151 + 332609152.

It is an arithmetic number, because the mean of its divisors is an integer number (332609152).

Almost surely, 2^665218303 is an apocalyptic number.

665218303 is a deficient number, since it is larger than the sum of its proper divisors (1).

665218303 is an equidigital number, since it uses as much as digits as its factorization.

665218303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 665218303 is about 25791.8262827587. The cubic root of 665218303 is about 872.9473749401.

The spelling of 665218303 in words is "six hundred sixty-five million, two hundred eighteen thousand, three hundred three".