9799999999877 has 2 divisors, whose sum is σ = 9799999999878. Its totient is φ = 9799999999876.

The previous prime is 9799999999873. The next prime is 9800000000009. The reversal of 9799999999877 is 7789999999979.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8320490244676 + 1479509755201 = 2884526^2 + 1216351^2 .

It is a cyclic number.

It is not a de Polignac number, because 9799999999877 - 2² = 9799999999873 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9799999999873) 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, 4899999999938 + 4899999999939.

It is an arithmetic number, because the mean of its divisors is an integer number (4899999999939).

Almost surely, 2^{9799999999877} is an apocalyptic number.

It is an amenable number.

9799999999877 is a deficient number, since it is larger than the sum of its proper divisors (1).

9799999999877 is an equidigital number, since it uses as much as digits as its factorization.

9799999999877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1063081821816, while the sum is 110.

The spelling of 9799999999877 in words is "nine trillion, seven hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred seventy-seven".