1223451111779 has 24 divisors (see below), whose sum is σ = 1357343849232. Its totient is φ = 1101608302080.

The previous prime is 1223451111713. The next prime is 1223451111797. The reversal of 1223451111779 is 9771111543221.

It is not a de Polignac number, because 1223451111779 - 2²⁸ = 1223182676323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223451111479) 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 23 ways as a sum of consecutive naturals, for example, 56273399 + ... + 56295135.

It is an arithmetic number, because the mean of its divisors is an integer number (56555993718).

Almost surely, 2^{1223451111779} is an apocalyptic number.

1223451111779 is a deficient number, since it is larger than the sum of its proper divisors (133892737453).

1223451111779 is a wasteful number, since it uses less digits than its factorization.

1223451111779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29927 (or 29914 counting only the distinct ones).

The product of its digits is 105840, while the sum is 44.

The spelling of 1223451111779 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-one million, one hundred eleven thousand, seven hundred seventy-nine".