999368099857 has 2 divisors, whose sum is σ = 999368099858. Its totient is φ = 999368099856.

The previous prime is 999368099803. The next prime is 999368099897. The reversal of 999368099857 is 758990863999.

It is a Cunningham number, because it is equal to 999684²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 999368099856 + 1 = 999684^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 999368099857 - 2¹¹ = 999368097809 is a prime.

It is not a weakly prime, because it can be changed into another prime (999368099897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499684049928 + 499684049929.

It is an arithmetic number, because the mean of its divisors is an integer number (499684049929).

Almost surely, 2^999368099857 is an apocalyptic number.

It is an amenable number.

999368099857 is a deficient number, since it is larger than the sum of its proper divisors (1).

999368099857 is an equidigital number, since it uses as much as digits as its factorization.

999368099857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2380855680, while the sum is 82.

The spelling of 999368099857 in words is "nine hundred ninety-nine billion, three hundred sixty-eight million, ninety-nine thousand, eight hundred fifty-seven".