12178137852 has 72 divisors (see below), whose sum is σ = 32522817600. Its totient is φ = 3835993728.

The previous prime is 12178137809. The next prime is 12178137943. The reversal of 12178137852 is 25873187121.

It is a junction number, because it is equal to n+sod(n) for n = 12178137798 and 12178137807.

It is a congruent number.

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, 75027 + ... + 173162.

It is an arithmetic number, because the mean of its divisors is an integer number (451705800).

Almost surely, 2^12178137852 is an apocalyptic number.

12178137852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12178137852 is an abundant number, since it is smaller than the sum of its proper divisors (20344679748).

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

12178137852 is a wasteful number, since it uses less digits than its factorization.

12178137852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248275 (or 248270 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The spelling of 12178137852 in words is "twelve billion, one hundred seventy-eight million, one hundred thirty-seven thousand, eight hundred fifty-two".