508666663 has 2 divisors, whose sum is σ = 508666664. Its totient is φ = 508666662.

The previous prime is 508666661. The next prime is 508666667. The reversal of 508666663 is 366666805.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 508666663 - 2¹ = 508666661 is a prime.

Together with 508666661, it forms a pair of twin primes.

It is equal to p_26787790 and since 508666663 and 26787790 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (508666661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254333331 + 254333332.

It is an arithmetic number, because the mean of its divisors is an integer number (254333332).

Almost surely, 2^508666663 is an apocalyptic number.

508666663 is a deficient number, since it is larger than the sum of its proper divisors (1).

508666663 is an equidigital number, since it uses as much as digits as its factorization.

508666663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 46.

The square root of 508666663 is about 22553.6396840953. The cubic root of 508666663 is about 798.2601056821.

The spelling of 508666663 in words is "five hundred eight million, six hundred sixty-six thousand, six hundred sixty-three".