18451934389 has 16 divisors (see below), whose sum is σ = 21173378688. Its totient is φ = 15751973952.

The previous prime is 18451934357. The next prime is 18451934393. The reversal of 18451934389 is 98343915481.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18451934389 - 2⁵ = 18451934357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18451934689) 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 15 ways as a sum of consecutive naturals, for example, 2076534 + ... + 2085400.

It is an arithmetic number, because the mean of its divisors is an integer number (1323336168).

Almost surely, 2^18451934389 is an apocalyptic number.

It is an amenable number.

18451934389 is a deficient number, since it is larger than the sum of its proper divisors (2721444299).

18451934389 is an equidigital number, since it uses as much as digits as its factorization.

18451934389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10044.

The product of its digits is 3732480, while the sum is 55.

The spelling of 18451934389 in words is "eighteen billion, four hundred fifty-one million, nine hundred thirty-four thousand, three hundred eighty-nine".