1643300225 has 24 divisors (see below), whose sum is σ = 2409101760. Its totient is φ = 1087974720.

The previous prime is 1643300221. The next prime is 1643300333. The reversal of 1643300225 is 5220033461.

It is not a de Polignac number, because 1643300225 - 2² = 1643300221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1643300194 and 1643300203.

It is not an unprimeable number, because it can be changed into a prime (1643300221) 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, 156827 + ... + 166976.

It is an arithmetic number, because the mean of its divisors is an integer number (100379240).

Almost surely, 2^1643300225 is an apocalyptic number.

It is an amenable number.

1643300225 is a deficient number, since it is larger than the sum of its proper divisors (765801535).

1643300225 is a wasteful number, since it uses less digits than its factorization.

1643300225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323849 (or 323844 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1643300225 is about 40537.6396081469. The cubic root of 1643300225 is about 1180.0642081790.

Adding to 1643300225 its reverse (5220033461), we get a palindrome (6863333686).

The spelling of 1643300225 in words is "one billion, six hundred forty-three million, three hundred thousand, two hundred twenty-five".