999998881177 has 2 divisors, whose sum is σ = 999998881178. Its totient is φ = 999998881176.

The previous prime is 999998881171. The next prime is 999998881199. The reversal of 999998881177 is 771188899999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680656350361 + 319342530816 = 825019^2 + 565104^2 .

It is a cyclic number.

It is not a de Polignac number, because 999998881177 - 2³ = 999998881169 is a prime.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999998881094 and 999998881103.

It is not a weakly prime, because it can be changed into another prime (999998881171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999440588 + 499999440589.

It is an arithmetic number, because the mean of its divisors is an integer number (499999440589).

Almost surely, 2^999998881177 is an apocalyptic number.

It is an amenable number.

999998881177 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998881177 is an equidigital number, since it uses as much as digits as its factorization.

999998881177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481421312, while the sum is 85.

The spelling of 999998881177 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred eighty-one thousand, one hundred seventy-seven".