12208394777 has 2 divisors, whose sum is σ = 12208394778. Its totient is φ = 12208394776.

The previous prime is 12208394761. The next prime is 12208394789. The reversal of 12208394777 is 77749380221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10172941321 + 2035453456 = 100861^2 + 45116^2 .

It is an emirp because it is prime and its reverse (77749380221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12208394777 - 2⁴ = 12208394761 is a prime.

It is not a weakly prime, because it can be changed into another prime (12208394677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104197388 + 6104197389.

It is an arithmetic number, because the mean of its divisors is an integer number (6104197389).

Almost surely, 2^12208394777 is an apocalyptic number.

It is an amenable number.

12208394777 is a deficient number, since it is larger than the sum of its proper divisors (1).

12208394777 is an equidigital number, since it uses as much as digits as its factorization.

12208394777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 50.

The spelling of 12208394777 in words is "twelve billion, two hundred eight million, three hundred ninety-four thousand, seven hundred seventy-seven".