9980209777 has 2 divisors, whose sum is σ = 9980209778. Its totient is φ = 9980209776.

The previous prime is 9980209747. The next prime is 9980209847. The reversal of 9980209777 is 7779020899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9918367281 + 61842496 = 99591^2 + 7864^2 .

It is a cyclic number.

It is not a de Polignac number, because 9980209777 - 2⁷ = 9980209649 is a prime.

It is not a weakly prime, because it can be changed into another prime (9980209747) 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, 4990104888 + 4990104889.

It is an arithmetic number, because the mean of its divisors is an integer number (4990104889).

Almost surely, 2^9980209777 is an apocalyptic number.

It is an amenable number.

9980209777 is a deficient number, since it is larger than the sum of its proper divisors (1).

9980209777 is an equidigital number, since it uses as much as digits as its factorization.

9980209777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000752, while the sum is 58.

The square root of 9980209777 is about 99900.9998798811. Note that the first 3 decimals coincide. The cubic root of 9980209777 is about 2153.0125266894.

The spelling of 9980209777 in words is "nine billion, nine hundred eighty million, two hundred nine thousand, seven hundred seventy-seven".