18923550225 has 12 divisors (see below), whose sum is σ = 31286936496. Its totient is φ = 10092560080.

The previous prime is 18923550203. The next prime is 18923550229. The reversal of 18923550225 is 52205532981.

It is not a de Polignac number, because 18923550225 - 2¹¹ = 18923548177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18923550229) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 126156927 + ... + 126157076.

It is an arithmetic number, because the mean of its divisors is an integer number (2607244708).

Almost surely, 2^18923550225 is an apocalyptic number.

18923550225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18923550225 is a deficient number, since it is larger than the sum of its proper divisors (12363386271).

18923550225 is a wasteful number, since it uses less digits than its factorization.

18923550225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252314016 (or 252314011 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 18923550225 in words is "eighteen billion, nine hundred twenty-three million, five hundred fifty thousand, two hundred twenty-five".