18888540181 has 4 divisors (see below), whose sum is σ = 21586903072. Its totient is φ = 16190177292.

The previous prime is 18888540179. The next prime is 18888540193. The reversal of 18888540181 is 18104588881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18888540181 - 2¹ = 18888540179 is a prime.

It is a super-2 number, since 2×18888540181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18888540481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349181435 + ... + 1349181448.

It is an arithmetic number, because the mean of its divisors is an integer number (5396725768).

Almost surely, 2^18888540181 is an apocalyptic number.

It is an amenable number.

18888540181 is a deficient number, since it is larger than the sum of its proper divisors (2698362891).

18888540181 is an equidigital number, since it uses as much as digits as its factorization.

18888540181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698362890.

The product of its (nonzero) digits is 655360, while the sum is 52.

The spelling of 18888540181 in words is "eighteen billion, eight hundred eighty-eight million, five hundred forty thousand, one hundred eighty-one".