18447400474481 has 24 divisors (see below), whose sum is σ = 20610167448192. Its totient is φ = 16494748063200.

The previous prime is 18447400474471. The next prime is 18447400474501.

18447400474481 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-18447400474481 is a prime.

It is a super-3 number, since 3×18447400474481³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18447400474441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270427880 + ... + 270496086.

It is an arithmetic number, because the mean of its divisors is an integer number (858756977008).

Almost surely, 2^{18447400474481} is an apocalyptic number.

18447400474481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18447400474481 is a deficient number, since it is larger than the sum of its proper divisors (2162766973711).

18447400474481 is a wasteful number, since it uses less digits than its factorization.

18447400474481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104933 (or 104922 counting only the distinct ones).

The product of its (nonzero) digits is 12845056, while the sum is 56.

The spelling of 18447400474481 in words is "eighteen trillion, four hundred forty-seven billion, four hundred million, four hundred seventy-four thousand, four hundred eighty-one".