9981999090036 has 36 divisors (see below), whose sum is σ = 25233553116772. Its totient is φ = 3327164550144.

The previous prime is 9981999090031. The next prime is 9981999090079. The reversal of 9981999090036 is 6300909991899.

It can be written as a sum of positive squares in 2 ways, for example, as 2860306267536 + 7121692822500 = 1691244^2 + 2668650^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981999090031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6298135 + ... + 7722078.

Almost surely, 2^{9981999090036} is an apocalyptic number.

It is an amenable number.

9981999090036 is an abundant number, since it is smaller than the sum of its proper divisors (15251554026736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9981999090036 is a wasteful number, since it uses less digits than its factorization.

9981999090036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14040000 (or 14039995 counting only the distinct ones).

The product of its (nonzero) digits is 76527504, while the sum is 72.

The spelling of 9981999090036 in words is "nine trillion, nine hundred eighty-one billion, nine hundred ninety-nine million, ninety thousand, thirty-six".