18240875481 has 4 divisors (see below), whose sum is σ = 24321167312. Its totient is φ = 12160583652.

The previous prime is 18240875449. The next prime is 18240875519. The reversal of 18240875481 is 18457804281.

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 18240875481 - 2⁵ = 18240875449 is a prime.

It is a super-2 number, since 2×18240875481² (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 18240875481.

It is not an unprimeable number, because it can be changed into a prime (18240875431) 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, 3040145911 + ... + 3040145916.

It is an arithmetic number, because the mean of its divisors is an integer number (6080291828).

Almost surely, 2^18240875481 is an apocalyptic number.

It is an amenable number.

18240875481 is a deficient number, since it is larger than the sum of its proper divisors (6080291831).

18240875481 is an equidigital number, since it uses as much as digits as its factorization.

18240875481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080291830.

The product of its (nonzero) digits is 573440, while the sum is 48.

The spelling of 18240875481 in words is "eighteen billion, two hundred forty million, eight hundred seventy-five thousand, four hundred eighty-one".