18271042557 has 16 divisors (see below), whose sum is σ = 25300941120. Its totient is φ = 11718317952.

The previous prime is 18271042513. The next prime is 18271042597. The reversal of 18271042557 is 75524017281.

It is not a de Polignac number, because 18271042557 - 2⁸ = 18271042301 is a prime.

It is a super-2 number, since 2×18271042557² (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 (18271042597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 914863 + ... + 934620.

It is an arithmetic number, because the mean of its divisors is an integer number (1581308820).

Almost surely, 2^18271042557 is an apocalyptic number.

It is an amenable number.

18271042557 is a deficient number, since it is larger than the sum of its proper divisors (7029898563).

18271042557 is a wasteful number, since it uses less digits than its factorization.

18271042557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849612.

The product of its (nonzero) digits is 156800, while the sum is 42.

The spelling of 18271042557 in words is "eighteen billion, two hundred seventy-one million, forty-two thousand, five hundred fifty-seven".