9900900090073 has 2 divisors, whose sum is σ = 9900900090074. Its totient is φ = 9900900090072.

The previous prime is 9900900090071. The next prime is 9900900090113. The reversal of 9900900090073 is 3700900090099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6641532031689 + 3259368058384 = 2577117^2 + 1805372^2 .

It is a cyclic number.

It is not a de Polignac number, because 9900900090073 - 2¹ = 9900900090071 is a prime.

Together with 9900900090071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9900900090071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4950450045036 + 4950450045037.

It is an arithmetic number, because the mean of its divisors is an integer number (4950450045037).

Almost surely, 2^{9900900090073} is an apocalyptic number.

It is an amenable number.

9900900090073 is a deficient number, since it is larger than the sum of its proper divisors (1).

9900900090073 is an equidigital number, since it uses as much as digits as its factorization.

9900900090073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137781, while the sum is 46.

The spelling of 9900900090073 in words is "nine trillion, nine hundred billion, nine hundred million, ninety thousand, seventy-three".