18903440225 has 12 divisors (see below), whose sum is σ = 23442079596. Its totient is φ = 15121582080.

The previous prime is 18903440221. The next prime is 18903440239. The reversal of 18903440225 is 52204430981.

It can be written as a sum of positive squares in 6 ways, for example, as 2439470881 + 16463969344 = 49391^2 + 128312^2 .

It is not a de Polignac number, because 18903440225 - 2² = 18903440221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18903440221) 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, 462209 + ... + 501441.

It is an arithmetic number, because the mean of its divisors is an integer number (1953506633).

Almost surely, 2^18903440225 is an apocalyptic number.

It is an amenable number.

18903440225 is a deficient number, since it is larger than the sum of its proper divisors (4538639371).

18903440225 is a wasteful number, since it uses less digits than its factorization.

18903440225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58516 (or 58511 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 18903440225 in words is "eighteen billion, nine hundred three million, four hundred forty thousand, two hundred twenty-five".