18985256163 has 12 divisors (see below), whose sum is σ = 27475588920. Its totient is φ = 12632633856.

The previous prime is 18985256161. The next prime is 18985256197. The reversal of 18985256163 is 36165258981.

18985256163 is a `hidden beast` number, since 18 + 9 + 8 + 5 + 2 + 5 + 616 + 3 = 666.

It is not a de Polignac number, because 18985256163 - 2¹ = 18985256161 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18985256161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2011998 + ... + 2021411.

It is an arithmetic number, because the mean of its divisors is an integer number (2289632410).

Almost surely, 2^18985256163 is an apocalyptic number.

18985256163 is a deficient number, since it is larger than the sum of its proper divisors (8490332757).

18985256163 is a wasteful number, since it uses less digits than its factorization.

18985256163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033938 (or 4033935 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 18985256163 in words is "eighteen billion, nine hundred eighty-five million, two hundred fifty-six thousand, one hundred sixty-three".