665505583 has 2 divisors, whose sum is σ = 665505584. Its totient is φ = 665505582.

The previous prime is 665505553. The next prime is 665505587. The reversal of 665505583 is 385505566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665505583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665505587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332752791 + 332752792.

It is an arithmetic number, because the mean of its divisors is an integer number (332752792).

Almost surely, 2^665505583 is an apocalyptic number.

665505583 is a deficient number, since it is larger than the sum of its proper divisors (1).

665505583 is an equidigital number, since it uses as much as digits as its factorization.

665505583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540000, while the sum is 43.

The square root of 665505583 is about 25797.3948878564. The cubic root of 665505583 is about 873.0730200247.

The spelling of 665505583 in words is "six hundred sixty-five million, five hundred five thousand, five hundred eighty-three".