12455775779 has 2 divisors, whose sum is σ = 12455775780. Its totient is φ = 12455775778.

The previous prime is 12455775751. The next prime is 12455775799. The reversal of 12455775779 is 97757755421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12455775779 - 2³² = 8160808483 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12455775799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6227887889 + 6227887890.

It is an arithmetic number, because the mean of its divisors is an integer number (6227887890).

Almost surely, 2^12455775779 is an apocalyptic number.

12455775779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12455775779 is an equidigital number, since it uses as much as digits as its factorization.

12455775779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21609000, while the sum is 59.

The spelling of 12455775779 in words is "twelve billion, four hundred fifty-five million, seven hundred seventy-five thousand, seven hundred seventy-nine".