12204913778 has 4 divisors (see below), whose sum is σ = 18307370670. Its totient is φ = 6102456888.

The previous prime is 12204913757. The next prime is 12204913789. The reversal of 12204913778 is 87731940221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87731940221 = 30911 ⋅2838211.

It can be written as a sum of positive squares in only one way, i.e., 7184766169 + 5020147609 = 84763^2 + 70853^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3051228443 + ... + 3051228446.

Almost surely, 2^12204913778 is an apocalyptic number.

12204913778 is a deficient number, since it is larger than the sum of its proper divisors (6102456892).

12204913778 is an equidigital number, since it uses as much as digits as its factorization.

12204913778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6102456891.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 12204913778 in words is "twelve billion, two hundred four million, nine hundred thirteen thousand, seven hundred seventy-eight".