188243815401 has 28 divisors (see below), whose sum is σ = 282420047028. Its totient is φ = 125414313984.

The previous prime is 188243815381. The next prime is 188243815439. The reversal of 188243815401 is 104518342881.

188243815401 is a `hidden beast` number, since 1 + 8 + 8 + 24 + 3 + 81 + 540 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 47393725401 + 140850090000 = 217701^2 + 375300^2 .

It is not a de Polignac number, because 188243815401 - 2¹¹ = 188243813353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (188243815481) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1049001 + ... + 1215273.

It is an arithmetic number, because the mean of its divisors is an integer number (10086430251).

Almost surely, 2^188243815401 is an apocalyptic number.

It is an amenable number.

188243815401 is a deficient number, since it is larger than the sum of its proper divisors (94176231627).

188243815401 is an equidigital number, since it uses as much as digits as its factorization.

188243815401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167844 (or 167829 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The spelling of 188243815401 in words is "one hundred eighty-eight billion, two hundred forty-three million, eight hundred fifteen thousand, four hundred one".