18199635813 has 24 divisors (see below), whose sum is σ = 27211511808. Its totient is φ = 11712187872.

The previous prime is 18199635781. The next prime is 18199635827. The reversal of 18199635813 is 31853699181.

It is not a de Polignac number, because 18199635813 - 2⁵ = 18199635781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18199635813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199633813) 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 23 ways as a sum of consecutive naturals, for example, 172881 + ... + 257462.

It is an arithmetic number, because the mean of its divisors is an integer number (1133812992).

Almost surely, 2^18199635813 is an apocalyptic number.

It is an amenable number.

18199635813 is a deficient number, since it is larger than the sum of its proper divisors (9011875995).

18199635813 is a wasteful number, since it uses less digits than its factorization.

18199635813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430513 (or 430510 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The spelling of 18199635813 in words is "eighteen billion, one hundred ninety-nine million, six hundred thirty-five thousand, eight hundred thirteen".