18549473445 has 160 divisors (see below), whose sum is σ = 35038967040. Its totient is φ = 9380966400.

The previous prime is 18549473443. The next prime is 18549473473. The reversal of 18549473445 is 54437494581.

18549473445 is a `hidden beast` number, since 1 + 85 + 494 + 7 + 34 + 45 = 666.

It is not a de Polignac number, because 18549473445 - 2¹ = 18549473443 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18549473391 and 18549473400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18549473443) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 122844120 + ... + 122844270.

It is an arithmetic number, because the mean of its divisors is an integer number (218993544).

Almost surely, 2^18549473445 is an apocalyptic number.

18549473445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18549473445 is a deficient number, since it is larger than the sum of its proper divisors (16489493595).

18549473445 is a wasteful number, since it uses less digits than its factorization.

18549473445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 368 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 18549473445 in words is "eighteen billion, five hundred forty-nine million, four hundred seventy-three thousand, four hundred forty-five".