18704444440781 has 32 divisors (see below), whose sum is σ = 21853293232896. Its totient is φ = 15952666329600.

The previous prime is 18704444440763. The next prime is 18704444440853.

18704444440781 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-18704444440781 is a prime.

It is a super-2 number, since 2×18704444440781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18704444440181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5761736 + ... + 8402766.

It is an arithmetic number, because the mean of its divisors is an integer number (682915413528).

Almost surely, 2^{18704444440781} is an apocalyptic number.

18704444440781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18704444440781 is a deficient number, since it is larger than the sum of its proper divisors (3148848792115).

18704444440781 is a wasteful number, since it uses less digits than its factorization.

18704444440781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2641394 (or 2641372 counting only the distinct ones).

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

The spelling of 18704444440781 in words is "eighteen trillion, seven hundred four billion, four hundred forty-four million, four hundred forty thousand, seven hundred eighty-one".