18018920811 has 4 divisors (see below), whose sum is σ = 24025227752. Its totient is φ = 12012613872.

The previous prime is 18018920749. The next prime is 18018920831. The reversal of 18018920811 is 11802981081.

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

It is not a de Polignac number, because 18018920811 - 2⁶ = 18018920747 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18018920811.

It is not an unprimeable number, because it can be changed into a prime (18018920831) 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, 3003153466 + ... + 3003153471.

It is an arithmetic number, because the mean of its divisors is an integer number (6006306938).

Almost surely, 2^18018920811 is an apocalyptic number.

18018920811 is a deficient number, since it is larger than the sum of its proper divisors (6006306941).

18018920811 is an equidigital number, since it uses as much as digits as its factorization.

18018920811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006306940.

The product of its (nonzero) digits is 9216, while the sum is 39.

The spelling of 18018920811 in words is "eighteen billion, eighteen million, nine hundred twenty thousand, eight hundred eleven".