18446864481 has 16 divisors (see below), whose sum is σ = 27359884800. Its totient is φ = 12283871184.

The previous prime is 18446864477. The next prime is 18446864563.

18446864481 is a `hidden beast` number, since 1 + 8 + 44 + 68 + 64 + 481 = 666.

18446864481 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18446864481 - 2² = 18446864477 is a prime.

It is a super-2 number, since 2×18446864481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18446814481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365841 + ... + 413198.

It is an arithmetic number, because the mean of its divisors is an integer number (1709992800).

Almost surely, 2^18446864481 is an apocalyptic number.

It is an amenable number.

18446864481 is a deficient number, since it is larger than the sum of its proper divisors (8913020319).

18446864481 is an equidigital number, since it uses as much as digits as its factorization.

18446864481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779925 (or 779919 counting only the distinct ones).

The product of its digits is 4718592, while the sum is 54.

The spelling of 18446864481 in words is "eighteen billion, four hundred forty-six million, eight hundred sixty-four thousand, four hundred eighty-one".