188461147878 has 20 divisors (see below), whose sum is σ = 422292572460. Its totient is φ = 62820382572.

The previous prime is 188461147817. The next prime is 188461147891. The reversal of 188461147878 is 878741164881.

188461147878 is a `hidden beast` number, since 1 + 8 + 8 + 4 + 611 + 4 + 7 + 8 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 581670048 + ... + 581670371.

It is an arithmetic number, because the mean of its divisors is an integer number (21114628623).

Almost surely, 2^188461147878 is an apocalyptic number.

188461147878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

188461147878 is an abundant number, since it is smaller than the sum of its proper divisors (233831424582).

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

188461147878 is a wasteful number, since it uses less digits than its factorization.

188461147878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163340433 (or 1163340424 counting only the distinct ones).

The product of its digits is 19267584, while the sum is 63.

The spelling of 188461147878 in words is "one hundred eighty-eight billion, four hundred sixty-one million, one hundred forty-seven thousand, eight hundred seventy-eight".