7988778911 has 2 divisors, whose sum is σ = 7988778912. Its totient is φ = 7988778910.

The previous prime is 7988778851. The next prime is 7988778937. The reversal of 7988778911 is 1198778897.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7988778911 - 2²² = 7984584607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7988778211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3994389455 + 3994389456.

It is an arithmetic number, because the mean of its divisors is an integer number (3994389456).

Almost surely, 2^7988778911 is an apocalyptic number.

7988778911 is a deficient number, since it is larger than the sum of its proper divisors (1).

7988778911 is an equidigital number, since it uses as much as digits as its factorization.

7988778911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14224896, while the sum is 65.

The square root of 7988778911 is about 89379.9692940202. The cubic root of 7988778911 is about 1999.0644717116.

The spelling of 7988778911 in words is "seven billion, nine hundred eighty-eight million, seven hundred seventy-eight thousand, nine hundred eleven".