18258089509 has 4 divisors (see below), whose sum is σ = 19917915840. Its totient is φ = 16598263180.

The previous prime is 18258089491. The next prime is 18258089527. The reversal of 18258089509 is 90598085281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18258089491) and next prime (18258089527).

It is a cyclic number.

It is not a de Polignac number, because 18258089509 - 2¹¹ = 18258087461 is a prime.

It is a super-2 number, since 2×18258089509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18258089509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18258389509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829913149 + ... + 829913170.

It is an arithmetic number, because the mean of its divisors is an integer number (4979478960).

Almost surely, 2^18258089509 is an apocalyptic number.

It is an amenable number.

18258089509 is a deficient number, since it is larger than the sum of its proper divisors (1659826331).

18258089509 is a wasteful number, since it uses less digits than its factorization.

18258089509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659826330.

The product of its (nonzero) digits is 2073600, while the sum is 55.

The spelling of 18258089509 in words is "eighteen billion, two hundred fifty-eight million, eighty-nine thousand, five hundred nine".