188408666556 has 36 divisors (see below), whose sum is σ = 519551172504. Its totient is φ = 57093535200.

The previous prime is 188408666549. The next prime is 188408666569. The reversal of 188408666556 is 655666804881.

188408666556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×188408666556² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 188408666493 and 188408666502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237889335 + ... + 237890126.

It is an arithmetic number, because the mean of its divisors is an integer number (14431977014).

Almost surely, 2^188408666556 is an apocalyptic number.

It is an amenable number.

188408666556 is an abundant number, since it is smaller than the sum of its proper divisors (331142505948).

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

188408666556 is a wasteful number, since it uses less digits than its factorization.

188408666556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475779482 (or 475779477 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 188408666556 in words is "one hundred eighty-eight billion, four hundred eight million, six hundred sixty-six thousand, five hundred fifty-six".