999990099973 has 2 divisors, whose sum is σ = 999990099974. Its totient is φ = 999990099972.

The previous prime is 999990099971. The next prime is 999990100001. The reversal of 999990099973 is 379990099999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 551301795009 + 448688304964 = 742497^2 + 669842^2 .

It is a cyclic number.

It is not a de Polignac number, because 999990099973 - 2¹ = 999990099971 is a prime.

Together with 999990099971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999990099971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499995049986 + 499995049987.

It is an arithmetic number, because the mean of its divisors is an integer number (499995049987).

Almost surely, 2^999990099973 is an apocalyptic number.

It is an amenable number.

999990099973 is a deficient number, since it is larger than the sum of its proper divisors (1).

999990099973 is an equidigital number, since it uses as much as digits as its factorization.

999990099973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903981141, while the sum is 82.

The spelling of 999990099973 in words is "nine hundred ninety-nine billion, nine hundred ninety million, ninety-nine thousand, nine hundred seventy-three".