9999953243887 has 2 divisors, whose sum is σ = 9999953243888. Its totient is φ = 9999953243886.

The previous prime is 9999953243821. The next prime is 9999953243893. The reversal of 9999953243887 is 7883423599999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9999953243887 - 2⁷ = 9999953243759 is a prime.

It is a super-2 number, since 2×9999953243887² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999953253887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999976621943 + 4999976621944.

It is an arithmetic number, because the mean of its divisors is an integer number (4999976621944).

Almost surely, 2^{9999953243887} is an apocalyptic number.

9999953243887 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999953243887 is an equidigital number, since it uses as much as digits as its factorization.

9999953243887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9523422720, while the sum is 85.

The spelling of 9999953243887 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred fifty-three million, two hundred forty-three thousand, eight hundred eighty-seven".