12118617378 has 48 divisors (see below), whose sum is σ = 30620428800. Its totient is φ = 3462460344.

The previous prime is 12118617323. The next prime is 12118617383. The reversal of 12118617378 is 87371681121.

12118617378 is a `hidden beast` number, since 1 + 21 + 1 + 8 + 617 + 3 + 7 + 8 = 666.

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, 975250 + ... + 987597.

It is an arithmetic number, because the mean of its divisors is an integer number (637925600).

Almost surely, 2^12118617378 is an apocalyptic number.

12118617378 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12118617378 is an abundant number, since it is smaller than the sum of its proper divisors (18501811422).

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

12118617378 is a wasteful number, since it uses less digits than its factorization.

12118617378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962876 (or 1962859 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The spelling of 12118617378 in words is "twelve billion, one hundred eighteen million, six hundred seventeen thousand, three hundred seventy-eight".