18389805825 has 24 divisors (see below), whose sum is σ = 31726415808. Its totient is φ = 9381465280.

The previous prime is 18389805817. The next prime is 18389805827. The reversal of 18389805825 is 52850898381.

It is not a de Polignac number, because 18389805825 - 2³ = 18389805817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18389805827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5328654 + ... + 5332103.

It is an arithmetic number, because the mean of its divisors is an integer number (1321933992).

Almost surely, 2^18389805825 is an apocalyptic number.

18389805825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18389805825 is a deficient number, since it is larger than the sum of its proper divisors (13336609983).

18389805825 is a wasteful number, since it uses less digits than its factorization.

18389805825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10660793 (or 10660788 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 57.

The spelling of 18389805825 in words is "eighteen billion, three hundred eighty-nine million, eight hundred five thousand, eight hundred twenty-five".