18145438431 has 8 divisors (see below), whose sum is σ = 24279409920. Its totient is φ = 12054212952.

The previous prime is 18145438411. The next prime is 18145438433. The reversal of 18145438431 is 13483454181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18145438431 - 2¹¹ = 18145436383 is a prime.

It is a super-2 number, since 2×18145438431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18145438433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10685511 + ... + 10687208.

It is an arithmetic number, because the mean of its divisors is an integer number (3034926240).

Almost surely, 2^18145438431 is an apocalyptic number.

18145438431 is a deficient number, since it is larger than the sum of its proper divisors (6133971489).

18145438431 is a wasteful number, since it uses less digits than its factorization.

18145438431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21373005.

The product of its digits is 184320, while the sum is 42.

The spelling of 18145438431 in words is "eighteen billion, one hundred forty-five million, four hundred thirty-eight thousand, four hundred thirty-one".