123445567879 has 4 divisors (see below), whose sum is σ = 123455477376. Its totient is φ = 123435658384.

The previous prime is 123445567871. The next prime is 123445567891. The reversal of 123445567879 is 978765544321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978765544321 = 623383 ⋅1570087.

It is a cyclic number.

It is not a de Polignac number, because 123445567879 - 2³ = 123445567871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123445567871) 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, 4936039 + ... + 4960984.

It is an arithmetic number, because the mean of its divisors is an integer number (30863869344).

Almost surely, 2^123445567879 is an apocalyptic number.

123445567879 is a deficient number, since it is larger than the sum of its proper divisors (9909497).

123445567879 is an equidigital number, since it uses as much as digits as its factorization.

123445567879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909496.

The product of its digits is 50803200, while the sum is 61.

The spelling of 123445567879 in words is "one hundred twenty-three billion, four hundred forty-five million, five hundred sixty-seven thousand, eight hundred seventy-nine".