188109568656 has 135 divisors (see below), whose sum is σ = 538585185801. Its totient is φ = 61289275392.

The previous prime is 188109568637. The next prime is 188109568657. The reversal of 188109568656 is 656865901881.

The square root of 188109568656 is 433716.

It is a perfect power (a square), and thus also a powerful number.

188109568656 is a `hidden beast` number, since 1 + 8 + 8 + 1 + 0 + 9 + 568 + 65 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 73595008656 + 114514560000 = 271284^2 + 338400^2 .

It is a junction number, because it is equal to n+sod(n) for n = 188109568593 and 188109568602.

It is not an unprimeable number, because it can be changed into a prime (188109568657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 244615440 + ... + 244616208.

Almost surely, 2^188109568656 is an apocalyptic number.

188109568656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

188109568656 is the 433716-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 188109568656

188109568656 is an abundant number, since it is smaller than the sum of its proper divisors (350475617145).

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

188109568656 is an frugal number, since it uses more digits than its factorization.

188109568656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 63.

The spelling of 188109568656 in words is "one hundred eighty-eight billion, one hundred nine million, five hundred sixty-eight thousand, six hundred fifty-six".