11978478277 has 2 divisors, whose sum is σ = 11978478278. Its totient is φ = 11978478276.

The previous prime is 11978478257. The next prime is 11978478289. The reversal of 11978478277 is 77287487911.

11978478277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9050477956 + 2928000321 = 95134^2 + 54111^2 .

It is an emirp because it is prime and its reverse (77287487911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11978478277 - 2¹⁵ = 11978445509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11978478247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5989239138 + 5989239139.

It is an arithmetic number, because the mean of its divisors is an integer number (5989239139).

Almost surely, 2^11978478277 is an apocalyptic number.

It is an amenable number.

11978478277 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978478277 is an equidigital number, since it uses as much as digits as its factorization.

11978478277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11063808, while the sum is 61.

The spelling of 11978478277 in words is "eleven billion, nine hundred seventy-eight million, four hundred seventy-eight thousand, two hundred seventy-seven".