665500005559 has 2 divisors, whose sum is σ = 665500005560. Its totient is φ = 665500005558.

The previous prime is 665500005557. The next prime is 665500005571. The reversal of 665500005559 is 955500005566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665500005559 - 2¹ = 665500005557 is a prime.

Together with 665500005557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665500005551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332750002779 + 332750002780.

It is an arithmetic number, because the mean of its divisors is an integer number (332750002780).

Almost surely, 2^665500005559 is an apocalyptic number.

665500005559 is a deficient number, since it is larger than the sum of its proper divisors (1).

665500005559 is an equidigital number, since it uses as much as digits as its factorization.

665500005559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1012500, while the sum is 46.

The spelling of 665500005559 in words is "six hundred sixty-five billion, five hundred million, five thousand, five hundred fifty-nine".