1805557225 has 6 divisors (see below), whose sum is σ = 2238890990. Its totient is φ = 1444445760.

The previous prime is 1805557223. The next prime is 1805557241. The reversal of 1805557225 is 5227555081.

It can be written as a sum of positive squares in 3 ways, for example, as 341806144 + 1463751081 = 18488^2 + 38259^2 .

It is not a de Polignac number, because 1805557225 - 2¹ = 1805557223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1805557223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36111120 + ... + 36111169.

Almost surely, 2^1805557225 is an apocalyptic number.

It is an amenable number.

1805557225 is a deficient number, since it is larger than the sum of its proper divisors (433333765).

1805557225 is an equidigital number, since it uses as much as digits as its factorization.

1805557225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72222299 (or 72222294 counting only the distinct ones).

The product of its (nonzero) digits is 140000, while the sum is 40.

The square root of 1805557225 is about 42491.8489242349. The cubic root of 1805557225 is about 1217.6909709755.

The spelling of 1805557225 in words is "one billion, eight hundred five million, five hundred fifty-seven thousand, two hundred twenty-five".