18544043522 has 4 divisors (see below), whose sum is σ = 27816065286. Its totient is φ = 9272021760.

The previous prime is 18544043521. The next prime is 18544043563. The reversal of 18544043522 is 22534044581.

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

It can be written as a sum of positive squares in only one way, i.e., 17490327001 + 1053716521 = 132251^2 + 32461^2 .

It is not an unprimeable number, because it can be changed into a prime (18544043521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4636010879 + ... + 4636010882.

Almost surely, 2^18544043522 is an apocalyptic number.

18544043522 is a deficient number, since it is larger than the sum of its proper divisors (9272021764).

18544043522 is an equidigital number, since it uses as much as digits as its factorization.

18544043522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272021763.

The product of its (nonzero) digits is 153600, while the sum is 38.

The spelling of 18544043522 in words is "eighteen billion, five hundred forty-four million, forty-three thousand, five hundred twenty-two".