18344274989 has 4 divisors (see below), whose sum is σ = 18533391324. Its totient is φ = 18155158656.

The previous prime is 18344274973. The next prime is 18344275007. The reversal of 18344274989 is 98947244381.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14242512964 + 4101762025 = 119342^2 + 64045^2 .

It is a cyclic number.

It is not a de Polignac number, because 18344274989 - 2⁴ = 18344274973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18344274919) 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 in 3 ways as a sum of consecutive naturals, for example, 94558022 + ... + 94558215.

It is an arithmetic number, because the mean of its divisors is an integer number (4633347831).

Almost surely, 2^18344274989 is an apocalyptic number.

It is an amenable number.

18344274989 is a deficient number, since it is larger than the sum of its proper divisors (189116335).

18344274989 is an equidigital number, since it uses as much as digits as its factorization.

18344274989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189116334.

The product of its digits is 13934592, while the sum is 59.

The spelling of 18344274989 in words is "eighteen billion, three hundred forty-four million, two hundred seventy-four thousand, nine hundred eighty-nine".