665618479 has 2 divisors, whose sum is σ = 665618480. Its totient is φ = 665618478.

The previous prime is 665618441. The next prime is 665618483. The reversal of 665618479 is 974816566.

665618479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665618479 - 2²⁵ = 632064047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665618579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332809239 + 332809240.

It is an arithmetic number, because the mean of its divisors is an integer number (332809240).

Almost surely, 2^665618479 is an apocalyptic number.

665618479 is a deficient number, since it is larger than the sum of its proper divisors (1).

665618479 is an equidigital number, since it uses as much as digits as its factorization.

665618479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 52.

The square root of 665618479 is about 25799.5829229854. The cubic root of 665618479 is about 873.1223864419.

The spelling of 665618479 in words is "six hundred sixty-five million, six hundred eighteen thousand, four hundred seventy-nine".