20181820001111 has 4 divisors (see below), whose sum is σ = 20381640001224. Its totient is φ = 19982000001000.

The previous prime is 20181820001099. The next prime is 20181820001141. The reversal of 20181820001111 is 11110002818102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20181820001111 - 2²² = 20181815806807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20181820001141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99909999905 + ... + 99910000106.

It is an arithmetic number, because the mean of its divisors is an integer number (5095410000306).

Almost surely, 2^{20181820001111} is an apocalyptic number.

20181820001111 is a deficient number, since it is larger than the sum of its proper divisors (199820000113).

20181820001111 is a wasteful number, since it uses less digits than its factorization.

20181820001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199820000112.

The product of its (nonzero) digits is 256, while the sum is 26.

Adding to 20181820001111 its reverse (11110002818102), we get a palindrome (31291822819213).

The spelling of 20181820001111 in words is "twenty trillion, one hundred eighty-one billion, eight hundred twenty million, one thousand, one hundred eleven".