18471839193 has 6 divisors (see below), whose sum is σ = 26681545514. Its totient is φ = 12314559456.

The previous prime is 18471839173. The next prime is 18471839227. The reversal of 18471839193 is 39193817481.

It is a happy number.

18471839193 is a `hidden beast` number, since 1 + 8 + 471 + 83 + 9 + 1 + 93 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14518322064 + 3953517129 = 120492^2 + 62877^2 .

It is not a de Polignac number, because 18471839193 - 2²¹ = 18469742041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18471839173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1026213280 + ... + 1026213297.

Almost surely, 2^18471839193 is an apocalyptic number.

It is an amenable number.

18471839193 is a deficient number, since it is larger than the sum of its proper divisors (8209706321).

18471839193 is a wasteful number, since it uses less digits than its factorization.

18471839193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052426583 (or 2052426580 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The spelling of 18471839193 in words is "eighteen billion, four hundred seventy-one million, eight hundred thirty-nine thousand, one hundred ninety-three".