123118153440 has 192 divisors, whose sum is σ = 412450424064. Its totient is φ = 30763655168.

The previous prime is 123118153397. The next prime is 123118153441. The reversal of 123118153440 is 44351811321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123118153441) 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, 1819087 + ... + 1885553.

It is an arithmetic number, because the mean of its divisors is an integer number (2148179292).

Almost surely, 2^123118153440 is an apocalyptic number.

123118153440 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 123118153440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206225212032).

123118153440 is an abundant number, since it is smaller than the sum of its proper divisors (289332270624).

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

123118153440 is a wasteful number, since it uses less digits than its factorization.

123118153440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66729 (or 66721 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

Adding to 123118153440 its reverse (44351811321), we get a palindrome (167469964761).

The spelling of 123118153440 in words is "one hundred twenty-three billion, one hundred eighteen million, one hundred fifty-three thousand, four hundred forty".