188406473680 has 20 divisors (see below), whose sum is σ = 438045051492. Its totient is φ = 75362589440.

The previous prime is 188406473663. The next prime is 188406473681. The reversal of 188406473680 is 86374604881.

It can be written as a sum of positive squares in 2 ways, for example, as 20775186496 + 167631287184 = 144136^2 + 409428^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188406473681) 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, 1177540381 + ... + 1177540540.

Almost surely, 2^188406473680 is an apocalyptic number.

188406473680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

188406473680 is an abundant number, since it is smaller than the sum of its proper divisors (249638577812).

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

188406473680 is a wasteful number, since it uses less digits than its factorization.

188406473680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355080934 (or 2355080928 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 188406473680 in words is "one hundred eighty-eight billion, four hundred six million, four hundred seventy-three thousand, six hundred eighty".