123456677779 has 8 divisors (see below), whose sum is σ = 126801192240. Its totient is φ = 120112576416.

The previous prime is 123456677761. The next prime is 123456677783. The reversal of 123456677779 is 977776654321.

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 123456677779 - 2³⁵ = 89096939411 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 123456677779.

It is not an unprimeable number, because it can be changed into a prime (123456627779) 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, 559332 + ... + 748174.

It is an arithmetic number, because the mean of its divisors is an integer number (15850149030).

Almost surely, 2^123456677779 is an apocalyptic number.

123456677779 is a deficient number, since it is larger than the sum of its proper divisors (3344514461).

123456677779 is a wasteful number, since it uses less digits than its factorization.

123456677779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206549.

The product of its digits is 93350880, while the sum is 64.

The spelling of 123456677779 in words is "one hundred twenty-three billion, four hundred fifty-six million, six hundred seventy-seven thousand, seven hundred seventy-nine".