18855436545 has 24 divisors (see below), whose sum is σ = 35653917312. Its totient is φ = 9142029600.

The previous prime is 18855436517. The next prime is 18855436549. The reversal of 18855436545 is 54563455881.

18855436545 is a `hidden beast` number, since 1 + 8 + 8 + 55 + 43 + 6 + 545 = 666.

It is not a de Polignac number, because 18855436545 - 2⁵ = 18855436513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18855436491 and 18855436500.

It is not an unprimeable number, because it can be changed into a prime (18855436549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19045401 + ... + 19046390.

It is an arithmetic number, because the mean of its divisors is an integer number (1485579888).

Almost surely, 2^18855436545 is an apocalyptic number.

18855436545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18855436545 is a deficient number, since it is larger than the sum of its proper divisors (16798480767).

18855436545 is a wasteful number, since it uses less digits than its factorization.

18855436545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38091813 (or 38091810 counting only the distinct ones).

The product of its digits is 11520000, while the sum is 54.

The spelling of 18855436545 in words is "eighteen billion, eight hundred fifty-five million, four hundred thirty-six thousand, five hundred forty-five".