665618347 has 2 divisors, whose sum is σ = 665618348. Its totient is φ = 665618346.

The previous prime is 665618339. The next prime is 665618399. The reversal of 665618347 is 743816566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665618347 - 2³ = 665618339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665618297 and 665618306.

It is not a weakly prime, because it can be changed into another prime (665619347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332809173 + 332809174.

It is an arithmetic number, because the mean of its divisors is an integer number (332809174).

Almost surely, 2^665618347 is an apocalyptic number.

665618347 is a deficient number, since it is larger than the sum of its proper divisors (1).

665618347 is an equidigital number, since it uses as much as digits as its factorization.

665618347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 665618347 is about 25799.5803648044. The cubic root of 665618347 is about 873.1223287250.

The spelling of 665618347 in words is "six hundred sixty-five million, six hundred eighteen thousand, three hundred forty-seven".