123678134556 has 24 divisors (see below), whose sum is σ = 288627816960. Its totient is φ = 41219544432.

The previous prime is 123678134551. The next prime is 123678134561. The reversal of 123678134556 is 655431876321.

It is an interprime number because it is at equal distance from previous prime (123678134551) and next prime (123678134561).

It is a junction number, because it is equal to n+sod(n) for n = 123678134499 and 123678134508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123678134551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732966 + ... + 885773.

It is an arithmetic number, because the mean of its divisors is an integer number (12026159040).

Almost surely, 2^123678134556 is an apocalyptic number.

It is an amenable number.

123678134556 is an abundant number, since it is smaller than the sum of its proper divisors (164949682404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123678134556 is a wasteful number, since it uses less digits than its factorization.

123678134556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625113 (or 1625111 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 51.

The spelling of 123678134556 in words is "one hundred twenty-three billion, six hundred seventy-eight million, one hundred thirty-four thousand, five hundred fifty-six".