9990099900871 has 2 divisors, whose sum is σ = 9990099900872. Its totient is φ = 9990099900870.

The previous prime is 9990099900857. The next prime is 9990099900881. The reversal of 9990099900871 is 1780099900999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9990099900871 - 2³⁹ = 9440344086983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9990099900871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990099900811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995049950435 + 4995049950436.

It is an arithmetic number, because the mean of its divisors is an integer number (4995049950436).

Almost surely, 2^{9990099900871} is an apocalyptic number.

9990099900871 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990099900871 is an equidigital number, since it uses as much as digits as its factorization.

9990099900871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29760696, while the sum is 70.

The spelling of 9990099900871 in words is "nine trillion, nine hundred ninety billion, ninety-nine million, nine hundred thousand, eight hundred seventy-one".