18045630509 has 24 divisors (see below), whose sum is σ = 19986251688. Its totient is φ = 16234803200.

The previous prime is 18045630479. The next prime is 18045630517. The reversal of 18045630509 is 90503654081.

It can be written as a sum of positive squares in 12 ways, for example, as 144528484 + 17901102025 = 12022^2 + 133795^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18045630509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045630529) 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 23 ways as a sum of consecutive naturals, for example, 1437749 + ... + 1450245.

It is an arithmetic number, because the mean of its divisors is an integer number (832760487).

Almost surely, 2^18045630509 is an apocalyptic number.

It is an amenable number.

18045630509 is a deficient number, since it is larger than the sum of its proper divisors (1940621179).

18045630509 is a wasteful number, since it uses less digits than its factorization.

18045630509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12673 (or 12644 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 18045630509 in words is "eighteen billion, forty-five million, six hundred thirty thousand, five hundred nine".