6665500663 has 2 divisors, whose sum is σ = 6665500664. Its totient is φ = 6665500662.

The previous prime is 6665500643. The next prime is 6665500669. The reversal of 6665500663 is 3660055666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6665500663 - 2¹⁷ = 6665369591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665500669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332750331 + 3332750332.

It is an arithmetic number, because the mean of its divisors is an integer number (3332750332).

Almost surely, 2^6665500663 is an apocalyptic number.

6665500663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665500663 is an equidigital number, since it uses as much as digits as its factorization.

6665500663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 43.

The square root of 6665500663 is about 81642.5174954815. The cubic root of 6665500663 is about 1881.9623262184.

The spelling of 6665500663 in words is "six billion, six hundred sixty-five million, five hundred thousand, six hundred sixty-three".