123345456779 has 8 divisors (see below), whose sum is σ = 123544676640. Its totient is φ = 123146358336.

The previous prime is 123345456739. The next prime is 123345456799. The reversal of 123345456779 is 977654543321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123345456779 - 2²⁸ = 123077021323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123345456739) 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 7 ways as a sum of consecutive naturals, for example, 2125157 + ... + 2182425.

It is an arithmetic number, because the mean of its divisors is an integer number (15443084580).

Almost surely, 2^123345456779 is an apocalyptic number.

123345456779 is a deficient number, since it is larger than the sum of its proper divisors (199219861).

123345456779 is an equidigital number, since it uses as much as digits as its factorization.

123345456779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60709.

The product of its digits is 19051200, while the sum is 56.

The spelling of 123345456779 in words is "one hundred twenty-three billion, three hundred forty-five million, four hundred fifty-six thousand, seven hundred seventy-nine".