18197243293 has 8 divisors (see below), whose sum is σ = 19987819200. Its totient is φ = 16489950048.

The previous prime is 18197243291. The next prime is 18197243297. The reversal of 18197243293 is 39234279181.

It is a happy number.

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 18197243293 - 2¹ = 18197243291 is a prime.

It is a super-2 number, since 2×18197243293² (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 (18197243291) 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, 20820208 + ... + 20821081.

It is an arithmetic number, because the mean of its divisors is an integer number (2498477400).

Almost surely, 2^18197243293 is an apocalyptic number.

It is an amenable number.

18197243293 is a deficient number, since it is larger than the sum of its proper divisors (1790575907).

18197243293 is a wasteful number, since it uses less digits than its factorization.

18197243293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41641331.

The product of its digits is 653184, while the sum is 49.

The spelling of 18197243293 in words is "eighteen billion, one hundred ninety-seven million, two hundred forty-three thousand, two hundred ninety-three".