18436566563481 has 16 divisors (see below), whose sum is σ = 27062850006720. Its totient is φ = 11071165907520.

The previous prime is 18436566563453. The next prime is 18436566563509.

18436566563481 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (18436566563453) and next prime (18436566563509).

It is not a de Polignac number, because 18436566563481 - 2⁶ = 18436566563417 is a prime.

It is a super-2 number, since 2×18436566563481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18436566563581) 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, 2562766290 + ... + 2562773483.

It is an arithmetic number, because the mean of its divisors is an integer number (1691428125420).

Almost surely, 2^{18436566563481} is an apocalyptic number.

18436566563481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18436566563481 is a deficient number, since it is larger than the sum of its proper divisors (8626283443239).

18436566563481 is a wasteful number, since it uses less digits than its factorization.

18436566563481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125539896.

The product of its digits is 298598400, while the sum is 66.

The spelling of 18436566563481 in words is "eighteen trillion, four hundred thirty-six billion, five hundred sixty-six million, five hundred sixty-three thousand, four hundred eighty-one".