12168657779 has 2 divisors, whose sum is σ = 12168657780. Its totient is φ = 12168657778.

The previous prime is 12168657751. The next prime is 12168657793. The reversal of 12168657779 is 97775686121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12168657779 - 2¹⁶ = 12168592243 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12168654779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6084328889 + 6084328890.

It is an arithmetic number, because the mean of its divisors is an integer number (6084328890).

Almost surely, 2^12168657779 is an apocalyptic number.

12168657779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12168657779 is an equidigital number, since it uses as much as digits as its factorization.

12168657779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 59.

The spelling of 12168657779 in words is "twelve billion, one hundred sixty-eight million, six hundred fifty-seven thousand, seven hundred seventy-nine".