18004501331 has 4 divisors (see below), whose sum is σ = 18076232664. Its totient is φ = 17932770000.

The previous prime is 18004501303. The next prime is 18004501343. The reversal of 18004501331 is 13310540081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13310540081 = 1201 ⋅11082881.

It is a cyclic number.

It is not a de Polignac number, because 18004501331 - 2¹⁰ = 18004500307 is a prime.

It is a super-2 number, since 2×18004501331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18004501331.

It is not an unprimeable number, because it can be changed into a prime (18004501381) 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, 35865290 + ... + 35865791.

It is an arithmetic number, because the mean of its divisors is an integer number (4519058166).

Almost surely, 2^18004501331 is an apocalyptic number.

18004501331 is a deficient number, since it is larger than the sum of its proper divisors (71731333).

18004501331 is an equidigital number, since it uses as much as digits as its factorization.

18004501331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71731332.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 18004501331 in words is "eighteen billion, four million, five hundred one thousand, three hundred thirty-one".