9999988866667 has 2 divisors, whose sum is σ = 9999988866668. Its totient is φ = 9999988866666.

The previous prime is 9999988866631. The next prime is 9999988866731. The reversal of 9999988866667 is 7666688899999.

It is a happy number.

9999988866667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9999988866667 is a prime.

It is a super-2 number, since 2×9999988866667² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9999988846667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999994433333 + 4999994433334.

It is an arithmetic number, because the mean of its divisors is an integer number (4999994433334).

Almost surely, 2^{9999988866667} is an apocalyptic number.

9999988866667 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999988866667 is an equidigital number, since it uses as much as digits as its factorization.

9999988866667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 274274574336, while the sum is 100.

The spelling of 9999988866667 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred eighty-eight million, eight hundred sixty-six thousand, six hundred sixty-seven".