11978417749 has 2 divisors, whose sum is σ = 11978417750. Its totient is φ = 11978417748.

The previous prime is 11978417699. The next prime is 11978417783. The reversal of 11978417749 is 94771487911.

11978417749 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., 9148922500 + 2829495249 = 95650^2 + 53193^2 .

It is a cyclic number.

It is not a de Polignac number, because 11978417749 - 2⁷ = 11978417621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11978417693 and 11978417702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11978417449) 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, 5989208874 + 5989208875.

It is an arithmetic number, because the mean of its divisors is an integer number (5989208875).

Almost surely, 2^11978417749 is an apocalyptic number.

It is an amenable number.

11978417749 is a deficient number, since it is larger than the sum of its proper divisors (1).

11978417749 is an equidigital number, since it uses as much as digits as its factorization.

11978417749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 58.

The spelling of 11978417749 in words is "eleven billion, nine hundred seventy-eight million, four hundred seventeen thousand, seven hundred forty-nine".