123445667779 has 16 divisors (see below), whose sum is σ = 143905102848. Its totient is φ = 103696830432.

The previous prime is 123445667753. The next prime is 123445667783. The reversal of 123445667779 is 977766544321.

It is a cyclic number.

It is not a de Polignac number, because 123445667779 - 2¹¹ = 123445665731 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123445664779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141514 + ... + 516640.

It is an arithmetic number, because the mean of its divisors is an integer number (8994068928).

Almost surely, 2^123445667779 is an apocalyptic number.

123445667779 is a deficient number, since it is larger than the sum of its proper divisors (20459435069).

123445667779 is an equidigital number, since it uses as much as digits as its factorization.

123445667779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376074.

The product of its digits is 53343360, while the sum is 61.

The spelling of 123445667779 in words is "one hundred twenty-three billion, four hundred forty-five million, six hundred sixty-seven thousand, seven hundred seventy-nine".