18131611073 has 4 divisors (see below), whose sum is σ = 18517390080. Its totient is φ = 17745832068.

The previous prime is 18131611021. The next prime is 18131611109. The reversal of 18131611073 is 37011613181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37011613181 = 4493 ⋅8237617.

It is a cyclic number.

It is not a de Polignac number, because 18131611073 - 2⁸ = 18131610817 is a prime.

It is a super-3 number, since 3×18131611073³ (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 not an unprimeable number, because it can be changed into a prime (18131617073) 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, 192889433 + ... + 192889526.

It is an arithmetic number, because the mean of its divisors is an integer number (4629347520).

Almost surely, 2^18131611073 is an apocalyptic number.

It is an amenable number.

18131611073 is a deficient number, since it is larger than the sum of its proper divisors (385779007).

18131611073 is an equidigital number, since it uses as much as digits as its factorization.

18131611073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385779006.

The product of its (nonzero) digits is 3024, while the sum is 32.

The spelling of 18131611073 in words is "eighteen billion, one hundred thirty-one million, six hundred eleven thousand, seventy-three".