12801222778 has 8 divisors (see below), whose sum is σ = 19720802772. Its totient is φ = 6227621856.

The previous prime is 12801222761. The next prime is 12801222781. The reversal of 12801222778 is 87722210821.

12801222778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12596246289 + 204976489 = 112233^2 + 14317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12801222778² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12801222778.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 86494675 + ... + 86494822.

Almost surely, 2^12801222778 is an apocalyptic number.

12801222778 is a deficient number, since it is larger than the sum of its proper divisors (6919579994).

12801222778 is a wasteful number, since it uses less digits than its factorization.

12801222778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172989536.

The product of its (nonzero) digits is 50176, while the sum is 40.

The spelling of 12801222778 in words is "twelve billion, eight hundred one million, two hundred twenty-two thousand, seven hundred seventy-eight".