18485438971 has 16 divisors (see below), whose sum is σ = 19646678304. Its totient is φ = 17332547584.

The previous prime is 18485438953. The next prime is 18485438977. The reversal of 18485438971 is 17983458481.

It is a cyclic number.

It is not a de Polignac number, because 18485438971 - 2¹¹ = 18485436923 is a prime.

It is a super-2 number, since 2×18485438971² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18485438977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5673975 + ... + 5677231.

It is an arithmetic number, because the mean of its divisors is an integer number (1227917394).

Almost surely, 2^18485438971 is an apocalyptic number.

18485438971 is a deficient number, since it is larger than the sum of its proper divisors (1161239333).

18485438971 is a wasteful number, since it uses less digits than its factorization.

18485438971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430.

The product of its digits is 7741440, while the sum is 58.

The spelling of 18485438971 in words is "eighteen billion, four hundred eighty-five million, four hundred thirty-eight thousand, nine hundred seventy-one".