18881767334481 has 16 divisors (see below), whose sum is σ = 26312724925440. Its totient is φ = 12021095647440.

The previous prime is 18881767334473. The next prime is 18881767334491. The reversal of 18881767334481 is 18443376718881.

It is not a de Polignac number, because 18881767334481 - 2³ = 18881767334473 is a prime.

It is a super-2 number, since 2×18881767334481² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18881767334411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220998325 + ... + 221083746.

It is an arithmetic number, because the mean of its divisors is an integer number (1644545307840).

Almost surely, 2^{18881767334481} is an apocalyptic number.

It is an amenable number.

18881767334481 is a deficient number, since it is larger than the sum of its proper divisors (7430957590959).

18881767334481 is a wasteful number, since it uses less digits than its factorization.

18881767334481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442082716.

The product of its digits is 173408256, while the sum is 69.

The spelling of 18881767334481 in words is "eighteen trillion, eight hundred eighty-one billion, seven hundred sixty-seven million, three hundred thirty-four thousand, four hundred eighty-one".