18102221854523 has 4 divisors (see below), whose sum is σ = 18102230900448. Its totient is φ = 18102212808600.

The previous prime is 18102221854471. The next prime is 18102221854579. The reversal of 18102221854523 is 32545812220181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18102221854523 - 2¹⁴ = 18102221838139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18102221824523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40403 + ... + 6017148.

It is an arithmetic number, because the mean of its divisors is an integer number (4525557725112).

Almost surely, 2^{18102221854523} is an apocalyptic number.

18102221854523 is a deficient number, since it is larger than the sum of its proper divisors (9045925).

18102221854523 is an equidigital number, since it uses as much as digits as its factorization.

18102221854523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045924.

The product of its (nonzero) digits is 307200, while the sum is 44.

The spelling of 18102221854523 in words is "eighteen trillion, one hundred two billion, two hundred twenty-one million, eight hundred fifty-four thousand, five hundred twenty-three".