123515313523512 has 16 divisors (see below), whose sum is σ = 308788283808840. Its totient is φ = 41171771174496.

The previous prime is 123515313523453. The next prime is 123515313523517. The reversal of 123515313523512 is 215325313515321.

It is a super-2 number, since 2×123515313523512² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123515313523517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573235698383 + ... + 2573235698430.

Almost surely, 2^{123515313523512} is an apocalyptic number.

123515313523512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123515313523512 is an abundant number, since it is smaller than the sum of its proper divisors (185272970285328).

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

123515313523512 is a wasteful number, since it uses less digits than its factorization.

123515313523512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146471396822 (or 5146471396818 counting only the distinct ones).

The product of its digits is 405000, while the sum is 42.

The spelling of 123515313523512 in words is "one hundred twenty-three trillion, five hundred fifteen billion, three hundred thirteen million, five hundred twenty-three thousand, five hundred twelve".