18197946823 has 8 divisors (see below), whose sum is σ = 20798469792. Its totient is φ = 15597627936.

The previous prime is 18197946751. The next prime is 18197946847. The reversal of 18197946823 is 32864979181.

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 18197946823 - 2¹⁷ = 18197815751 is a prime.

It is a super-3 number, since 3×18197946823³ (a number of 32 digits) contains 333 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 (18197940823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318561 + ... + 371317.

It is an arithmetic number, because the mean of its divisors is an integer number (2599808724).

Almost surely, 2^18197946823 is an apocalyptic number.

18197946823 is a deficient number, since it is larger than the sum of its proper divisors (2600522969).

18197946823 is an equidigital number, since it uses as much as digits as its factorization.

18197946823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102041.

The product of its digits is 5225472, while the sum is 58.

The spelling of 18197946823 in words is "eighteen billion, one hundred ninety-seven million, nine hundred forty-six thousand, eight hundred twenty-three".