18243564907 has 4 divisors (see below), whose sum is σ = 18243857376. Its totient is φ = 18243272440.

The previous prime is 18243564887. The next prime is 18243564931. The reversal of 18243564907 is 70946534281.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18243564907 - 2¹¹ = 18243562859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18243564407) 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, 10948 + ... + 191329.

It is an arithmetic number, because the mean of its divisors is an integer number (4560964344).

It is a 1-persistent number, because it is pandigital, but 2⋅18243564907 = 36487129814 is not.

Almost surely, 2^18243564907 is an apocalyptic number.

18243564907 is a deficient number, since it is larger than the sum of its proper divisors (292469).

18243564907 is an equidigital number, since it uses as much as digits as its factorization.

18243564907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292468.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 18243564907 in words is "eighteen billion, two hundred forty-three million, five hundred sixty-four thousand, nine hundred seven".