123345677779 has 4 divisors (see below), whose sum is σ = 126679344784. Its totient is φ = 120012010776.

The previous prime is 123345677639. The next prime is 123345677783. The reversal of 123345677779 is 977776543321.

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 123345677779 - 2²¹ = 123343580627 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 (123345677579) 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, 1666833447 + ... + 1666833520.

It is an arithmetic number, because the mean of its divisors is an integer number (31669836196).

Almost surely, 2^123345677779 is an apocalyptic number.

123345677779 is a deficient number, since it is larger than the sum of its proper divisors (3333667005).

123345677779 is an equidigital number, since it uses as much as digits as its factorization.

123345677779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333667004.

The product of its digits is 46675440, while the sum is 61.

The spelling of 123345677779 in words is "one hundred twenty-three billion, three hundred forty-five million, six hundred seventy-seven thousand, seven hundred seventy-nine".