18195335861 has 4 divisors (see below), whose sum is σ = 18197855232. Its totient is φ = 18192816492.

The previous prime is 18195335849. The next prime is 18195335881. The reversal of 18195335861 is 16853359181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18195335861 - 2¹⁰ = 18195334837 is a prime.

It is a super-2 number, since 2×18195335861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195335881) 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 3 ways as a sum of consecutive naturals, for example, 1248821 + ... + 1263306.

It is an arithmetic number, because the mean of its divisors is an integer number (4549463808).

Almost surely, 2^18195335861 is an apocalyptic number.

It is an amenable number.

18195335861 is a deficient number, since it is larger than the sum of its proper divisors (2519371).

18195335861 is an equidigital number, since it uses as much as digits as its factorization.

18195335861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519370.

The product of its digits is 777600, while the sum is 50.

The spelling of 18195335861 in words is "eighteen billion, one hundred ninety-five million, three hundred thirty-five thousand, eight hundred sixty-one".