1223455567779 has 8 divisors (see below), whose sum is σ = 1812526767120. Its totient is φ = 815637045168.

The previous prime is 1223455567739. The next prime is 1223455567819. The reversal of 1223455567779 is 9777655543221.

1223455567779 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 4 + 5 + 556 + 7 + 7 + 79 = 666.

It is an interprime number because it is at equal distance from previous prime (1223455567739) and next prime (1223455567819).

It is not a de Polignac number, because 1223455567779 - 2¹² = 1223455563683 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1223455567739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22656584562 + ... + 22656584615.

It is an arithmetic number, because the mean of its divisors is an integer number (226565845890).

Almost surely, 2^{1223455567779} is an apocalyptic number.

1223455567779 is a deficient number, since it is larger than the sum of its proper divisors (589071199341).

1223455567779 is an equidigital number, since it uses as much as digits as its factorization.

1223455567779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45313169186 (or 45313169180 counting only the distinct ones).

The product of its digits is 111132000, while the sum is 63.

The spelling of 1223455567779 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-five million, five hundred sixty-seven thousand, seven hundred seventy-nine".