99999579998393 has 2 divisors, whose sum is σ = 99999579998394. Its totient is φ = 99999579998392.

The previous prime is 99999579998389. The next prime is 99999579998401. The reversal of 99999579998393 is 39389997599999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70231556702329 + 29768023296064 = 8380427^2 + 5456008^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999579998393 - 2² = 99999579998389 is a prime.

It is not a weakly prime, because it can be changed into another prime (99999579998303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999789999196 + 49999789999197.

It is an arithmetic number, because the mean of its divisors is an integer number (49999789999197).

Almost surely, 2^{99999579998393} is an apocalyptic number.

It is an amenable number.

99999579998393 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999579998393 is an equidigital number, since it uses as much as digits as its factorization.

99999579998393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 976299632280, while the sum is 107.

The spelling of 99999579998393 in words is "ninety-nine trillion, nine hundred ninety-nine billion, five hundred seventy-nine million, nine hundred ninety-eight thousand, three hundred ninety-three".