18168224534 has 4 divisors (see below), whose sum is σ = 27252336804. Its totient is φ = 9084112266.

The previous prime is 18168224491. The next prime is 18168224539. The reversal of 18168224534 is 43542286181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43542286181 = 653 ⋅66680377.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168224539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4542056132 + ... + 4542056135.

It is an arithmetic number, because the mean of its divisors is an integer number (6813084201).

Almost surely, 2^18168224534 is an apocalyptic number.

18168224534 is a deficient number, since it is larger than the sum of its proper divisors (9084112270).

18168224534 is an equidigital number, since it uses as much as digits as its factorization.

18168224534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9084112269.

The product of its digits is 368640, while the sum is 44.

The spelling of 18168224534 in words is "eighteen billion, one hundred sixty-eight million, two hundred twenty-four thousand, five hundred thirty-four".