99178861289 has 2 divisors, whose sum is σ = 99178861290. Its totient is φ = 99178861288.

The previous prime is 99178861283. The next prime is 99178861307. The reversal of 99178861289 is 98216887199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96444408025 + 2734453264 = 310555^2 + 52292^2 .

It is an emirp because it is prime and its reverse (98216887199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99178861289 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (99178861283) 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, 49589430644 + 49589430645.

It is an arithmetic number, because the mean of its divisors is an integer number (49589430645).

Almost surely, 2^99178861289 is an apocalyptic number.

It is an amenable number.

99178861289 is a deficient number, since it is larger than the sum of its proper divisors (1).

99178861289 is an equidigital number, since it uses as much as digits as its factorization.

99178861289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 68.

The spelling of 99178861289 in words is "ninety-nine billion, one hundred seventy-eight million, eight hundred sixty-one thousand, two hundred eighty-nine".