1223333456779 has 4 divisors (see below), whose sum is σ = 1398095379184. Its totient is φ = 1048571534376.

The previous prime is 1223333456773. The next prime is 1223333456789. The reversal of 1223333456779 is 9776543333221.

It is a happy number.

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 1223333456779 - 2⁷ = 1223333456651 is a prime.

It is a super-2 number, since 2×1223333456779² (a number of 25 digits) contains 22 as substring.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1223333456773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87380961192 + ... + 87380961205.

It is an arithmetic number, because the mean of its divisors is an integer number (349523844796).

Almost surely, 2^{1223333456779} is an apocalyptic number.

1223333456779 is a deficient number, since it is larger than the sum of its proper divisors (174761922405).

1223333456779 is an equidigital number, since it uses as much as digits as its factorization.

1223333456779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174761922404.

The product of its digits is 17146080, while the sum is 55.

The spelling of 1223333456779 in words is "one trillion, two hundred twenty-three billion, three hundred thirty-three million, four hundred fifty-six thousand, seven hundred seventy-nine".