18191820011 has 8 divisors (see below), whose sum is σ = 18546583824. Its totient is φ = 17837483040.

The previous prime is 18191819951. The next prime is 18191820029. The reversal of 18191820011 is 11002819181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18191820011 - 2¹⁴ = 18191803627 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 18191820011.

It is not an unprimeable number, because it can be changed into a prime (18191820211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19961 + ... + 191786.

It is an arithmetic number, because the mean of its divisors is an integer number (2318322978).

Almost surely, 2^18191820011 is an apocalyptic number.

18191820011 is a deficient number, since it is larger than the sum of its proper divisors (354763813).

18191820011 is a wasteful number, since it uses less digits than its factorization.

18191820011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213421.

The product of its (nonzero) digits is 1152, while the sum is 32.

The spelling of 18191820011 in words is "eighteen billion, one hundred ninety-one million, eight hundred twenty thousand, eleven".