18055431271 has 16 divisors (see below), whose sum is σ = 18345040000. Its totient is φ = 17768727648.

The previous prime is 18055431263. The next prime is 18055431287. The reversal of 18055431271 is 17213455081.

It is a cyclic number.

It is not a de Polignac number, because 18055431271 - 2³ = 18055431263 is a prime.

It is the 134371-st Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18055431271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055431371) by changing a digit.

It is a nontrivial repunit in base 134370.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11305045 + ... + 11306641.

It is an arithmetic number, because the mean of its divisors is an integer number (1146565000).

Almost surely, 2^18055431271 is an apocalyptic number.

18055431271 is a deficient number, since it is larger than the sum of its proper divisors (289608729).

18055431271 is a wasteful number, since it uses less digits than its factorization.

18055431271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398.

The product of its (nonzero) digits is 33600, while the sum is 37.

The spelling of 18055431271 in words is "eighteen billion, fifty-five million, four hundred thirty-one thousand, two hundred seventy-one".