18195403855 has 4 divisors (see below), whose sum is σ = 21834484632. Its totient is φ = 14556323080.

The previous prime is 18195403829. The next prime is 18195403867. The reversal of 18195403855 is 55830459181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18195403855 - 2⁵ = 18195403823 is a prime.

It is a super-2 number, since 2×18195403855² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18195403799 and 18195403808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819540381 + ... + 1819540390.

It is an arithmetic number, because the mean of its divisors is an integer number (5458621158).

Almost surely, 2^18195403855 is an apocalyptic number.

18195403855 is a deficient number, since it is larger than the sum of its proper divisors (3639080777).

18195403855 is an equidigital number, since it uses as much as digits as its factorization.

18195403855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639080776.

The product of its (nonzero) digits is 864000, while the sum is 49.

The spelling of 18195403855 in words is "eighteen billion, one hundred ninety-five million, four hundred three thousand, eight hundred fifty-five".