18725259509 has 8 divisors (see below), whose sum is σ = 20629810080. Its totient is φ = 16854418000.

The previous prime is 18725259503. The next prime is 18725259529. The reversal of 18725259509 is 90595252781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18725259509 - 2¹² = 18725255413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18725259503) 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 7 ways as a sum of consecutive naturals, for example, 8426099 + ... + 8428320.

It is an arithmetic number, because the mean of its divisors is an integer number (2578726260).

Almost surely, 2^18725259509 is an apocalyptic number.

It is an amenable number.

18725259509 is a deficient number, since it is larger than the sum of its proper divisors (1904550571).

18725259509 is a wasteful number, since it uses less digits than its factorization.

18725259509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16854531.

The product of its (nonzero) digits is 2268000, while the sum is 53.

The spelling of 18725259509 in words is "eighteen billion, seven hundred twenty-five million, two hundred fifty-nine thousand, five hundred nine".