18020010811 has 4 divisors (see below), whose sum is σ = 19658193624. Its totient is φ = 16381828000.

The previous prime is 18020010787. The next prime is 18020010857. The reversal of 18020010811 is 11801002081.

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 18020010811 - 2¹⁹ = 18019486523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18020010871) 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, 819091390 + ... + 819091411.

It is an arithmetic number, because the mean of its divisors is an integer number (4914548406).

Almost surely, 2^18020010811 is an apocalyptic number.

18020010811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18020010811 is a deficient number, since it is larger than the sum of its proper divisors (1638182813).

18020010811 is a wasteful number, since it uses less digits than its factorization.

18020010811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638182812.

The product of its (nonzero) digits is 128, while the sum is 22.

Adding to 18020010811 its reverse (11801002081), we get a palindrome (29821012892).

The spelling of 18020010811 in words is "eighteen billion, twenty million, ten thousand, eight hundred eleven".