12549218353778 has 6 divisors (see below), whose sum is σ = 18823835045421. Its totient is φ = 6274606671972.

The previous prime is 12549218353751. The next prime is 12549218353871. The reversal of 12549218353778 is 87735381294521.

It can be written as a sum of positive squares in 2 ways, for example, as 12282102003889 + 267116349889 = 3504583^2 + 516833^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2504917.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3757376 + ... + 6262292.

Almost surely, 2^{12549218353778} is an apocalyptic number.

12549218353778 is a deficient number, since it is larger than the sum of its proper divisors (6274616691643).

12549218353778 is an frugal number, since it uses more digits than its factorization.

12549218353778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5009836 (or 2504919 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 65.

The spelling of 12549218353778 in words is "twelve trillion, five hundred forty-nine billion, two hundred eighteen million, three hundred fifty-three thousand, seven hundred seventy-eight".