998783999977 has 2 divisors, whose sum is σ = 998783999978. Its totient is φ = 998783999976.

The previous prime is 998783999963. The next prime is 998784000001. The reversal of 998783999977 is 779999387899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611506796121 + 387277203856 = 781989^2 + 622316^2 .

It is a cyclic number.

It is not a de Polignac number, because 998783999977 - 2¹⁹ = 998783475689 is a prime.

It is a super-2 number, since 2×998783999977² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (998783999947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499391999988 + 499391999989.

It is an arithmetic number, because the mean of its divisors is an integer number (499391999989).

Almost surely, 2^998783999977 is an apocalyptic number.

It is an amenable number.

998783999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

998783999977 is an equidigital number, since it uses as much as digits as its factorization.

998783999977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34998578496, while the sum is 94.

The spelling of 998783999977 in words is "nine hundred ninety-eight billion, seven hundred eighty-three million, nine hundred ninety-nine thousand, nine hundred seventy-seven".