99999988666663 has 2 divisors, whose sum is σ = 99999988666664. Its totient is φ = 99999988666662.

The previous prime is 99999988666657. The next prime is 99999988666667. The reversal of 99999988666663 is 36666688999999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99999988666663 - 2³⁷ = 99862549713191 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999988666667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999994333331 + 49999994333332.

It is an arithmetic number, because the mean of its divisors is an integer number (49999994333332).

Almost surely, 2^{99999988666663} is an apocalyptic number.

99999988666663 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999988666663 is an equidigital number, since it uses as much as digits as its factorization.

99999988666663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793437161472, while the sum is 103.

The spelling of 99999988666663 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-eight million, six hundred sixty-six thousand, six hundred sixty-three".