18037545681 has 4 divisors (see below), whose sum is σ = 24050060912. Its totient is φ = 12025030452.

The previous prime is 18037545679. The next prime is 18037545707. The reversal of 18037545681 is 18654573081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18037545681 - 2¹ = 18037545679 is a prime.

It is a super-3 number, since 3×18037545681³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18037545681.

It is not an unprimeable number, because it can be changed into a prime (18037545611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3006257611 + ... + 3006257616.

It is an arithmetic number, because the mean of its divisors is an integer number (6012515228).

Almost surely, 2^18037545681 is an apocalyptic number.

It is an amenable number.

18037545681 is a deficient number, since it is larger than the sum of its proper divisors (6012515231).

18037545681 is an equidigital number, since it uses as much as digits as its factorization.

18037545681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6012515230.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 18037545681 in words is "eighteen billion, thirty-seven million, five hundred forty-five thousand, six hundred eighty-one".