1223455567778 has 32 divisors (see below), whose sum is σ = 1901869632000. Its totient is φ = 589656044160.

The previous prime is 1223455567739. The next prime is 1223455567819. The reversal of 1223455567778 is 8777655543221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1223455567778.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136404878 + ... + 136413846.

It is an arithmetic number, because the mean of its divisors is an integer number (59433426000).

Almost surely, 2^{1223455567778} is an apocalyptic number.

1223455567778 is a deficient number, since it is larger than the sum of its proper divisors (678414064222).

1223455567778 is a wasteful number, since it uses less digits than its factorization.

1223455567778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17450.

The product of its digits is 98784000, while the sum is 62.

The spelling of 1223455567778 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-five million, five hundred sixty-seven thousand, seven hundred seventy-eight".