18573037581 has 16 divisors (see below), whose sum is σ = 28333707264. Its totient is φ = 10601188464.

The previous prime is 18573037547. The next prime is 18573037607.

18573037581 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18573037581 - 2¹⁹ = 18572513293 is a prime.

It is a super-2 number, since 2×18573037581² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18573037581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18573037531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479925 + ... + 517178.

It is an arithmetic number, because the mean of its divisors is an integer number (1770856704).

Almost surely, 2^18573037581 is an apocalyptic number.

It is an amenable number.

18573037581 is a deficient number, since it is larger than the sum of its proper divisors (9760669683).

18573037581 is an equidigital number, since it uses as much as digits as its factorization.

18573037581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998000.

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 18573037581 in words is "eighteen billion, five hundred seventy-three million, thirty-seven thousand, five hundred eighty-one".