188399887545 has 24 divisors (see below), whose sum is σ = 318140096256. Its totient is φ = 95191519392.

The previous prime is 188399887523. The next prime is 188399887549. The reversal of 188399887545 is 545788993881.

188399887545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 188399887545 - 2¹¹ = 188399885497 is a prime.

It is a super-2 number, since 2×188399887545² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (188399887549) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 17390697 + ... + 17401526.

It is an arithmetic number, because the mean of its divisors is an integer number (13255837344).

Almost surely, 2^188399887545 is an apocalyptic number.

188399887545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

188399887545 is a deficient number, since it is larger than the sum of its proper divisors (129740208711).

188399887545 is a wasteful number, since it uses less digits than its factorization.

188399887545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34792269 (or 34792250 counting only the distinct ones).

The product of its digits is 696729600, while the sum is 75.

The spelling of 188399887545 in words is "one hundred eighty-eight billion, three hundred ninety-nine million, eight hundred eighty-seven thousand, five hundred forty-five".