18321749271 has 12 divisors (see below), whose sum is σ = 30245427472. Its totient is φ = 10469570976.

The previous prime is 18321749249. The next prime is 18321749293. The reversal of 18321749271 is 17294712381.

18321749271 is a `hidden beast` number, since 1 + 83 + 2 + 17 + 492 + 71 = 666.

It is an interprime number because it is at equal distance from previous prime (18321749249) and next prime (18321749293).

It is not a de Polignac number, because 18321749271 - 2¹⁴ = 18321732887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321749071) 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, 145410646 + ... + 145410771.

Almost surely, 2^18321749271 is an apocalyptic number.

18321749271 is a deficient number, since it is larger than the sum of its proper divisors (11923678201).

18321749271 is a wasteful number, since it uses less digits than its factorization.

18321749271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290821430 (or 290821427 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The spelling of 18321749271 in words is "eighteen billion, three hundred twenty-one million, seven hundred forty-nine thousand, two hundred seventy-one".