1223640444011 has 4 divisors (see below), whose sum is σ = 1223648214192. Its totient is φ = 1223632673832.

The previous prime is 1223640443969. The next prime is 1223640444023. The reversal of 1223640444011 is 1104440463221.

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 1223640444011 - 2⁶ = 1223640443947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223640444041) 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, 3643880 + ... + 3965493.

It is an arithmetic number, because the mean of its divisors is an integer number (305912053548).

Almost surely, 2^{1223640444011} is an apocalyptic number.

1223640444011 is a deficient number, since it is larger than the sum of its proper divisors (7770181).

1223640444011 is an equidigital number, since it uses as much as digits as its factorization.

1223640444011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770180.

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 1223640444011 in words is "one trillion, two hundred twenty-three billion, six hundred forty million, four hundred forty-four thousand, eleven".