665618339 has 2 divisors, whose sum is σ = 665618340. Its totient is φ = 665618338.

The previous prime is 665618297. The next prime is 665618347. The reversal of 665618339 is 933816566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665618339 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665618293 and 665618302.

It is not a weakly prime, because it can be changed into another prime (665618399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332809169 + 332809170.

It is an arithmetic number, because the mean of its divisors is an integer number (332809170).

Almost surely, 2^665618339 is an apocalyptic number.

665618339 is a deficient number, since it is larger than the sum of its proper divisors (1).

665618339 is an equidigital number, since it uses as much as digits as its factorization.

665618339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 47.

The square root of 665618339 is about 25799.5802097631. The cubic root of 665618339 is about 873.1223252270.

The spelling of 665618339 in words is "six hundred sixty-five million, six hundred eighteen thousand, three hundred thirty-nine".