18241743845 has 8 divisors (see below), whose sum is σ = 23573945976. Its totient is φ = 13470826176.

The previous prime is 18241743829. The next prime is 18241743851. The reversal of 18241743845 is 54834714281.

It is a Cunningham number, because it is equal to 135062²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 2698386916 + 15543356929 = 51946^2 + 124673^2 .

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 18241743845 - 2⁴ = 18241743829 is a prime.

It is a super-2 number, since 2×18241743845² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18241743845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140321042 + ... + 140321171.

It is an arithmetic number, because the mean of its divisors is an integer number (2946743247).

Almost surely, 2^18241743845 is an apocalyptic number.

It is an amenable number.

18241743845 is a deficient number, since it is larger than the sum of its proper divisors (5332202131).

18241743845 is a wasteful number, since it uses less digits than its factorization.

18241743845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280642231.

The product of its digits is 860160, while the sum is 47.

The spelling of 18241743845 in words is "eighteen billion, two hundred forty-one million, seven hundred forty-three thousand, eight hundred forty-five".