9999993999973 has 2 divisors, whose sum is σ = 9999993999974. Its totient is φ = 9999993999972.

The previous prime is 9999993999971. The next prime is 9999994000001. The reversal of 9999993999973 is 3799993999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5197155194529 + 4802838805444 = 2279727^2 + 2191538^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999993999973 - 2¹ = 9999993999971 is a prime.

Together with 9999993999971, 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 (9999993999971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999996999986 + 4999996999987.

It is an arithmetic number, because the mean of its divisors is an integer number (4999996999987).

Almost surely, 2^{9999993999973} is an apocalyptic number.

It is an amenable number.

9999993999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999993999973 is an equidigital number, since it uses as much as digits as its factorization.

9999993999973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 219667417263, while the sum is 103.

The spelling of 9999993999973 in words is "nine trillion, nine hundred ninety-nine billion, nine hundred ninety-three million, nine hundred ninety-nine thousand, nine hundred seventy-three".