1223445666789 has 6 divisors (see below), whose sum is σ = 1767199296486. Its totient is φ = 815630444520.

The previous prime is 1223445666727. The next prime is 1223445666791. The reversal of 1223445666789 is 9876665443221.

It can be written as a sum of positive squares in only one way, i.e., 871104888900 + 352340777889 = 933330^2 + 593583^2 .

It is not a de Polignac number, because 1223445666789 - 2⁹ = 1223445666277 is a prime.

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 (1223445666889) 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 5 ways as a sum of consecutive naturals, for example, 67969203702 + ... + 67969203719.

It is an arithmetic number, because the mean of its divisors is an integer number (294533216081).

Almost surely, 2^{1223445666789} is an apocalyptic number.

It is an amenable number.

1223445666789 is a deficient number, since it is larger than the sum of its proper divisors (543753629697).

1223445666789 is a wasteful number, since it uses less digits than its factorization.

1223445666789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135938407427 (or 135938407424 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 63.

The spelling of 1223445666789 in words is "one trillion, two hundred twenty-three billion, four hundred forty-five million, six hundred sixty-six thousand, seven hundred eighty-nine".