18443768445 has 40 divisors (see below), whose sum is σ = 34802291040. Its totient is φ = 9318952800.

The previous prime is 18443768393. The next prime is 18443768449. The reversal of 18443768445 is 54486734481.

18443768445 is a `hidden beast` number, since 18 + 443 + 76 + 84 + 45 = 666.

It is not a de Polignac number, because 18443768445 - 2¹⁰ = 18443767421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18443768391 and 18443768400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443768449) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1190731 + ... + 1206120.

It is an arithmetic number, because the mean of its divisors is an integer number (870057276).

Almost surely, 2^18443768445 is an apocalyptic number.

18443768445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18443768445 is a deficient number, since it is larger than the sum of its proper divisors (16358522595).

18443768445 is a wasteful number, since it uses less digits than its factorization.

18443768445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396887 (or 2396878 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 54.

The spelling of 18443768445 in words is "eighteen billion, four hundred forty-three million, seven hundred sixty-eight thousand, four hundred forty-five".