18231537673 has 4 divisors (see below), whose sum is σ = 19024213248. Its totient is φ = 17438862100.

The previous prime is 18231537601. The next prime is 18231537697. The reversal of 18231537673 is 37673513281.

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: 37673513281 = 67 ⋅562291243.

It is a cyclic number.

It is not a de Polignac number, because 18231537673 - 2¹⁷ = 18231406601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18231537073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396337753 + ... + 396337798.

It is an arithmetic number, because the mean of its divisors is an integer number (4756053312).

Almost surely, 2^18231537673 is an apocalyptic number.

It is an amenable number.

18231537673 is a deficient number, since it is larger than the sum of its proper divisors (792675575).

18231537673 is an equidigital number, since it uses as much as digits as its factorization.

18231537673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792675574.

The product of its digits is 635040, while the sum is 46.

The spelling of 18231537673 in words is "eighteen billion, two hundred thirty-one million, five hundred thirty-seven thousand, six hundred seventy-three".