18456865481 has 4 divisors (see below), whose sum is σ = 18516985872. Its totient is φ = 18396745092.

The previous prime is 18456865477. The next prime is 18456865501.

18456865481 is nontrivially palindromic in base 10.

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 a cyclic number.

It is not a de Polignac number, because 18456865481 - 2² = 18456865477 is a prime.

It is a super-2 number, since 2×18456865481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18456865181) 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, 30059735 + ... + 30060348.

It is an arithmetic number, because the mean of its divisors is an integer number (4629246468).

Almost surely, 2^18456865481 is an apocalyptic number.

It is an amenable number.

18456865481 is a deficient number, since it is larger than the sum of its proper divisors (60120391).

18456865481 is an equidigital number, since it uses as much as digits as its factorization.

18456865481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60120390.

The product of its digits is 7372800, while the sum is 56.

The spelling of 18456865481 in words is "eighteen billion, four hundred fifty-six million, eight hundred sixty-five thousand, four hundred eighty-one".