18443555534481 has 64 divisors (see below), whose sum is σ = 30982595635200. Its totient is φ = 9480312576000.

The previous prime is 18443555534479. The next prime is 18443555534501.

18443555534481 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18443555534481 - 2¹ = 18443555534479 is a prime.

It is a super-2 number, since 2×18443555534481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18443555534471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18111681 + ... + 19102881.

It is an arithmetic number, because the mean of its divisors is an integer number (484103056800).

Almost surely, 2^{18443555534481} is an apocalyptic number.

18443555534481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18443555534481 is a deficient number, since it is larger than the sum of its proper divisors (12539040100719).

18443555534481 is a wasteful number, since it uses less digits than its factorization.

18443555534481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992070.

The product of its digits is 92160000, while the sum is 60.

The spelling of 18443555534481 in words is "eighteen trillion, four hundred forty-three billion, five hundred fifty-five million, five hundred thirty-four thousand, four hundred eighty-one".