99999888866693 has 2 divisors, whose sum is σ = 99999888866694. Its totient is φ = 99999888866692.

The previous prime is 99999888866651. The next prime is 99999888866719. The reversal of 99999888866693 is 39666888899999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78737617990084 + 21262270876609 = 8873422^2 + 4611103^2 .

It is an emirp because it is prime and its reverse (39666888899999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99999888866693 - 2⁴⁰ = 98900377238917 is a prime.

It is a super-2 number, since 2×99999888866693² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999888866393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999944433346 + 49999944433347.

It is an arithmetic number, because the mean of its divisors is an integer number (49999944433347).

Almost surely, 2^{99999888866693} is an apocalyptic number.

It is an amenable number.

99999888866693 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999888866693 is an equidigital number, since it uses as much as digits as its factorization.

99999888866693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1410554953728, while the sum is 107.

The spelling of 99999888866693 in words is "ninety-nine trillion, nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred sixty-six thousand, six hundred ninety-three".