1222243555778 has 16 divisors (see below), whose sum is σ = 2098369623744. Its totient is φ = 523044927600.

The previous prime is 1222243555763. The next prime is 1222243555853. The reversal of 1222243555778 is 8775553422221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64468448 + ... + 64487403.

It is an arithmetic number, because the mean of its divisors is an integer number (131148101484).

Almost surely, 2^{1222243555778} is an apocalyptic number.

1222243555778 is a deficient number, since it is larger than the sum of its proper divisors (876126067966).

1222243555778 is a wasteful number, since it uses less digits than its factorization.

1222243555778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128956537.

The product of its digits is 9408000, while the sum is 53.

Adding to 1222243555778 its reverse (8775553422221), we get a palindrome (9997796977999).

The spelling of 1222243555778 in words is "one trillion, two hundred twenty-two billion, two hundred forty-three million, five hundred fifty-five thousand, seven hundred seventy-eight".