998559999977 has 2 divisors, whose sum is σ = 998559999978. Its totient is φ = 998559999976.

The previous prime is 998559999961. The next prime is 998560000013. The reversal of 998559999977 is 779999955899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 881615835136 + 116944164841 = 938944^2 + 341971^2 .

It is a cyclic number.

It is not a de Polignac number, because 998559999977 - 2⁴ = 998559999961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 998559999977.

It is not a weakly prime, because it can be changed into another prime (998559999277) 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, 499279999988 + 499279999989.

It is an arithmetic number, because the mean of its divisors is an integer number (499279999989).

Almost surely, 2^998559999977 is an apocalyptic number.

It is an amenable number.

998559999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

998559999977 is an equidigital number, since it uses as much as digits as its factorization.

998559999977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46873096200, while the sum is 95.

The spelling of 998559999977 in words is "nine hundred ninety-eight billion, five hundred fifty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".