9938872777 has 2 divisors, whose sum is σ = 9938872778. Its totient is φ = 9938872776.

The previous prime is 9938872751. The next prime is 9938872799. The reversal of 9938872777 is 7772788399.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7677965376 + 2260907401 = 87624^2 + 47549^2 .

It is a cyclic number.

It is not a de Polignac number, because 9938872777 - 2⁷ = 9938872649 is a prime.

It is not a weakly prime, because it can be changed into another prime (9938872717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4969436388 + 4969436389.

It is an arithmetic number, because the mean of its divisors is an integer number (4969436389).

Almost surely, 2^9938872777 is an apocalyptic number.

It is an amenable number.

9938872777 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938872777 is an equidigital number, since it uses as much as digits as its factorization.

9938872777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74680704, while the sum is 67.

The square root of 9938872777 is about 99693.8953848228. The cubic root of 9938872777 is about 2150.0358946234.

The spelling of 9938872777 in words is "nine billion, nine hundred thirty-eight million, eight hundred seventy-two thousand, seven hundred seventy-seven".