123351520138 has 48 divisors (see below), whose sum is σ = 234875433024. Its totient is φ = 48044149440.

The previous prime is 123351520037. The next prime is 123351520157. The reversal of 123351520138 is 831025153321.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3857331 + ... + 3889177.

It is an arithmetic number, because the mean of its divisors is an integer number (4893238188).

Almost surely, 2^123351520138 is an apocalyptic number.

123351520138 is a deficient number, since it is larger than the sum of its proper divisors (111523912886).

123351520138 is a wasteful number, since it uses less digits than its factorization.

123351520138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35467 (or 35460 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 123351520138 its reverse (831025153321), we get a palindrome (954376673459).

The spelling of 123351520138 in words is "one hundred twenty-three billion, three hundred fifty-one million, five hundred twenty thousand, one hundred thirty-eight".