123480137856 has 128 divisors (see below), whose sum is σ = 346306809600. Its totient is φ = 38875161600.

The previous prime is 123480137779. The next prime is 123480137861. The reversal of 123480137856 is 658731084321.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2389411 + ... + 2440541.

It is an arithmetic number, because the mean of its divisors is an integer number (2705521950).

Almost surely, 2^123480137856 is an apocalyptic number.

123480137856 is a gapful number since it is divisible by the number (16) 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 123480137856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173153404800).

123480137856 is an abundant number, since it is smaller than the sum of its proper divisors (222826671744).

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

123480137856 is a wasteful number, since it uses less digits than its factorization.

123480137856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51498 (or 51486 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 123480137856 in words is "one hundred twenty-three billion, four hundred eighty million, one hundred thirty-seven thousand, eight hundred fifty-six".