181820101011 has 4 divisors (see below), whose sum is σ = 242426801352. Its totient is φ = 121213400672.

The previous prime is 181820100961. The next prime is 181820101033. The reversal of 181820101011 is 110101028181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110101028181 = 3 ⋅36700342727.

It is a cyclic number.

It is not a de Polignac number, because 181820101011 - 2⁶ = 181820100947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181820101091) 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 3 ways as a sum of consecutive naturals, for example, 30303350166 + ... + 30303350171.

It is an arithmetic number, because the mean of its divisors is an integer number (60606700338).

Almost surely, 2^181820101011 is an apocalyptic number.

181820101011 is a deficient number, since it is larger than the sum of its proper divisors (60606700341).

181820101011 is an equidigital number, since it uses as much as digits as its factorization.

181820101011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60606700340.

The product of its (nonzero) digits is 128, while the sum is 24.

Adding to 181820101011 its reverse (110101028181), we get a palindrome (291921129192).

The spelling of 181820101011 in words is "one hundred eighty-one billion, eight hundred twenty million, one hundred one thousand, eleven".