18385280725 has 24 divisors (see below), whose sum is σ = 26443460288. Its totient is φ = 12418876800.

The previous prime is 18385280699. The next prime is 18385280747. The reversal of 18385280725 is 52708258381.

It is not a de Polignac number, because 18385280725 - 2¹³ = 18385272533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 772296 + ... + 795745.

Almost surely, 2^18385280725 is an apocalyptic number.

It is an amenable number.

18385280725 is a deficient number, since it is larger than the sum of its proper divisors (8058179563).

18385280725 is a wasteful number, since it uses less digits than its factorization.

18385280725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568125 (or 1568120 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 49.

The spelling of 18385280725 in words is "eighteen billion, three hundred eighty-five million, two hundred eighty thousand, seven hundred twenty-five".