1223445555679 has 4 divisors (see below), whose sum is σ = 1223695090576. Its totient is φ = 1223196020784.

The previous prime is 1223445555611. The next prime is 1223445555697. The reversal of 1223445555679 is 9765555443221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1223445555679 - 2³³ = 1214855621087 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223445555379) 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 3 ways as a sum of consecutive naturals, for example, 124760094 + ... + 124769899.

It is an arithmetic number, because the mean of its divisors is an integer number (305923772644).

Almost surely, 2^{1223445555679} is an apocalyptic number.

1223445555679 is a deficient number, since it is larger than the sum of its proper divisors (249534897).

1223445555679 is an equidigital number, since it uses as much as digits as its factorization.

1223445555679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249534896.

The product of its digits is 45360000, while the sum is 58.

The spelling of 1223445555679 in words is "one trillion, two hundred twenty-three billion, four hundred forty-five million, five hundred fifty-five thousand, six hundred seventy-nine".