123381806556 has 48 divisors (see below), whose sum is σ = 310098475008. Its totient is φ = 38070120000.

The previous prime is 123381806543. The next prime is 123381806557. The reversal of 123381806556 is 655608183321.

123381806556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×123381806556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123381806557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7201695 + ... + 7218806.

It is an arithmetic number, because the mean of its divisors is an integer number (6460384896).

Almost surely, 2^123381806556 is an apocalyptic number.

It is an amenable number.

123381806556 is an abundant number, since it is smaller than the sum of its proper divisors (186716668452).

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

123381806556 is a wasteful number, since it uses less digits than its factorization.

123381806556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14420562 (or 14420560 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 48.

Adding to 123381806556 its reverse (655608183321), we get a palindrome (778989989877).

The spelling of 123381806556 in words is "one hundred twenty-three billion, three hundred eighty-one million, eight hundred six thousand, five hundred fifty-six".