9999988807 has 2 divisors, whose sum is σ = 9999988808. Its totient is φ = 9999988806.

The previous prime is 9999988769. The next prime is 9999988811. The reversal of 9999988807 is 7088899999.

It is a strong prime.

It is an emirp because it is prime and its reverse (7088899999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9999988807 - 2⁷ = 9999988679 is a prime.

It is a super-2 number, since 2×9999988807² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999988907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999994403 + 4999994404.

It is an arithmetic number, because the mean of its divisors is an integer number (4999994404).

Almost surely, 2^9999988807 is an apocalyptic number.

9999988807 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999988807 is an equidigital number, since it uses as much as digits as its factorization.

9999988807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211631616, while the sum is 76.

The square root of 9999988807 is about 99999.9440349843. The cubic root of 9999988807 is about 2154.4338862120.

The spelling of 9999988807 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred seven".