18884503572481 has 4 divisors (see below), whose sum is σ = 18884517902932. Its totient is φ = 18884489242032.

The previous prime is 18884503572479. The next prime is 18884503572563. The reversal of 18884503572481 is 18427530548881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14240547532225 + 4643956040256 = 3773665^2 + 2154984^2 .

It is a cyclic number.

It is not a de Polignac number, because 18884503572481 - 2¹ = 18884503572479 is a prime.

It is a super-2 number, since 2×18884503572481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18884503572401) 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 3 ways as a sum of consecutive naturals, for example, 4962906 + ... + 7899331.

It is an arithmetic number, because the mean of its divisors is an integer number (4721129475733).

Almost surely, 2^{18884503572481} is an apocalyptic number.

It is an amenable number.

18884503572481 is a deficient number, since it is larger than the sum of its proper divisors (14330451).

18884503572481 is a wasteful number, since it uses less digits than its factorization.

18884503572481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14330450.

The product of its (nonzero) digits is 68812800, while the sum is 64.

The spelling of 18884503572481 in words is "eighteen trillion, eight hundred eighty-four billion, five hundred three million, five hundred seventy-two thousand, four hundred eighty-one".