188780019993 has 6 divisors (see below), whose sum is σ = 272682251114. Its totient is φ = 125853346656.

The previous prime is 188780019947. The next prime is 188780020021. The reversal of 188780019993 is 399910087881.

It can be written as a sum of positive squares in only one way, i.e., 186530699664 + 2249320329 = 431892^2 + 47427^2 .

It is not a de Polignac number, because 188780019993 - 2⁶ = 188780019929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188780019993.

It is not an unprimeable number, because it can be changed into a prime (188780019793) 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 5 ways as a sum of consecutive naturals, for example, 10487778880 + ... + 10487778897.

Almost surely, 2^188780019993 is an apocalyptic number.

It is an amenable number.

188780019993 is a deficient number, since it is larger than the sum of its proper divisors (83902231121).

188780019993 is a wasteful number, since it uses less digits than its factorization.

188780019993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20975557783 (or 20975557780 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 63.

The spelling of 188780019993 in words is "one hundred eighty-eight billion, seven hundred eighty million, nineteen thousand, nine hundred ninety-three".