123426505560 has 128 divisors (see below), whose sum is σ = 393509145600. Its totient is φ = 30863185920.

The previous prime is 123426505519. The next prime is 123426505567. The reversal of 123426505560 is 65505624321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123426505567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 441211 + ... + 664469.

It is an arithmetic number, because the mean of its divisors is an integer number (3074290200).

Almost surely, 2^123426505560 is an apocalyptic number.

123426505560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123426505560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196754572800).

123426505560 is an abundant number, since it is smaller than the sum of its proper divisors (270082640040).

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

123426505560 is a wasteful number, since it uses less digits than its factorization.

123426505560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223561 (or 223557 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 123426505560 in words is "one hundred twenty-three billion, four hundred twenty-six million, five hundred five thousand, five hundred sixty".