18865725505885 has 16 divisors (see below), whose sum is σ = 23191768756800. Its totient is φ = 14724004831360.

The previous prime is 18865725505877. The next prime is 18865725505889. The reversal of 18865725505885 is 58850552756881.

It is not a de Polignac number, because 18865725505885 - 2³ = 18865725505877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18865725505889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5146794 + ... + 8013796.

It is an arithmetic number, because the mean of its divisors is an integer number (1449485547300).

Almost surely, 2^{18865725505885} is an apocalyptic number.

It is an amenable number.

18865725505885 is a deficient number, since it is larger than the sum of its proper divisors (4326043250915).

18865725505885 is a wasteful number, since it uses less digits than its factorization.

18865725505885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899148.

The product of its (nonzero) digits is 1075200000, while the sum is 73.

The spelling of 18865725505885 in words is "eighteen trillion, eight hundred sixty-five billion, seven hundred twenty-five million, five hundred five thousand, eight hundred eighty-five".