18213187443 has 16 divisors (see below), whose sum is σ = 26765026176. Its totient is φ = 10924496640.

The previous prime is 18213187427. The next prime is 18213187459. The reversal of 18213187443 is 34478131281.

It is an interprime number because it is at equal distance from previous prime (18213187427) and next prime (18213187459).

It is not a de Polignac number, because 18213187443 - 2⁴ = 18213187427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18213187395 and 18213187404.

It is not an unprimeable number, because it can be changed into a prime (18213182443) 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, 2841721 + ... + 2848122.

It is an arithmetic number, because the mean of its divisors is an integer number (1672814136).

Almost surely, 2^18213187443 is an apocalyptic number.

18213187443 is a deficient number, since it is larger than the sum of its proper divisors (8551838733).

18213187443 is a wasteful number, since it uses less digits than its factorization.

18213187443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689954.

The product of its digits is 129024, while the sum is 42.

It can be divided in two parts, 18213187 and 443, that added together give a triangular number (18213630 = T₆₀₃₅).

The spelling of 18213187443 in words is "eighteen billion, two hundred thirteen million, one hundred eighty-seven thousand, four hundred forty-three".