999961448323769 has 2 divisors, whose sum is σ = 999961448323770. Its totient is φ = 999961448323768.

The previous prime is 999961448323723. The next prime is 999961448323771. The reversal of 999961448323769 is 967323844169999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674191870692025 + 325769577631744 = 25965205^2 + 18049088^2 .

It is a cyclic number.

It is not a de Polignac number, because 999961448323769 - 2²⁸ = 999961179888313 is a prime.

It is a super-2 number, since 2×999961448323769² (a number of 31 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 999961448323771, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (999961448323069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499980724161884 + 499980724161885.

It is an arithmetic number, because the mean of its divisors is an integer number (499980724161885).

Almost surely, 2^{999961448323769} is an apocalyptic number.

It is an amenable number.

999961448323769 is a deficient number, since it is larger than the sum of its proper divisors (1).

999961448323769 is an equidigital number, since it uses as much as digits as its factorization.

999961448323769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34284321792, while the sum is 89.

The spelling of 999961448323769 in words is "nine hundred ninety-nine trillion, nine hundred sixty-one billion, four hundred forty-eight million, three hundred twenty-three thousand, seven hundred sixty-nine".