9969919877 has 2 divisors, whose sum is σ = 9969919878. Its totient is φ = 9969919876.

The previous prime is 9969919793. The next prime is 9969919901. The reversal of 9969919877 is 7789199699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9026140036 + 943779841 = 95006^2 + 30721^2 .

It is a cyclic number.

It is not a de Polignac number, because 9969919877 - 2²² = 9965725573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9969909877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4984959938 + 4984959939.

It is an arithmetic number, because the mean of its divisors is an integer number (4984959939).

Almost surely, 2^9969919877 is an apocalyptic number.

It is an amenable number.

9969919877 is a deficient number, since it is larger than the sum of its proper divisors (1).

9969919877 is an equidigital number, since it uses as much as digits as its factorization.

9969919877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138883248, while the sum is 74.

The square root of 9969919877 is about 99849.4861128489. The cubic root of 9969919877 is about 2152.2723317646.

The spelling of 9969919877 in words is "nine billion, nine hundred sixty-nine million, nine hundred nineteen thousand, eight hundred seventy-seven".