18199890863 has 8 divisors (see below), whose sum is σ = 22690773120. Its totient is φ = 14181733080.

The previous prime is 18199890859. The next prime is 18199890871. The reversal of 18199890863 is 36809899181.

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 18199890863 - 2² = 18199890859 is a prime.

It is a super-2 number, since 2×18199890863² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18199890796 and 18199890805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18199890803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118181033 + ... + 118181186.

It is an arithmetic number, because the mean of its divisors is an integer number (2836346640).

Almost surely, 2^18199890863 is an apocalyptic number.

18199890863 is a deficient number, since it is larger than the sum of its proper divisors (4490882257).

18199890863 is a wasteful number, since it uses less digits than its factorization.

18199890863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236362237.

The product of its (nonzero) digits is 6718464, while the sum is 62.

The spelling of 18199890863 in words is "eighteen billion, one hundred ninety-nine million, eight hundred ninety thousand, eight hundred sixty-three".