664516663 has 2 divisors, whose sum is σ = 664516664. Its totient is φ = 664516662.

The previous prime is 664516649. The next prime is 664516669. The reversal of 664516663 is 366615466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664516663 - 2¹⁷ = 664385591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664516669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332258331 + 332258332.

It is an arithmetic number, because the mean of its divisors is an integer number (332258332).

Almost surely, 2^664516663 is an apocalyptic number.

664516663 is a deficient number, since it is larger than the sum of its proper divisors (1).

664516663 is an equidigital number, since it uses as much as digits as its factorization.

664516663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 43.

The square root of 664516663 is about 25778.2207105145. The cubic root of 664516663 is about 872.6403527876.

The spelling of 664516663 in words is "six hundred sixty-four million, five hundred sixteen thousand, six hundred sixty-three".