18119890801 has 4 divisors (see below), whose sum is σ = 18120623332. Its totient is φ = 18119158272.

The previous prime is 18119890799. The next prime is 18119890813. The reversal of 18119890801 is 10809891181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10809891181 = 3203 ⋅3374927.

It can be written as a sum of positive squares in 2 ways, for example, as 7052640400 + 11067250401 = 83980^2 + 105201^2 .

It is a cyclic number.

It is not a de Polignac number, because 18119890801 - 2¹ = 18119890799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18119890891) 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, 327816 + ... + 379081.

It is an arithmetic number, because the mean of its divisors is an integer number (4530155833).

Almost surely, 2^18119890801 is an apocalyptic number.

It is an amenable number.

18119890801 is a deficient number, since it is larger than the sum of its proper divisors (732531).

18119890801 is an equidigital number, since it uses as much as digits as its factorization.

18119890801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732530.

The product of its (nonzero) digits is 41472, while the sum is 46.

The spelling of 18119890801 in words is "eighteen billion, one hundred nineteen million, eight hundred ninety thousand, eight hundred one".