225646643 has 4 divisors (see below), whose sum is σ = 227161200. Its totient is φ = 224132088.

The previous prime is 225646639. The next prime is 225646669. The reversal of 225646643 is 346646522.

225646643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 225646643 - 2² = 225646639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225646597 and 225646606.

It is not an unprimeable number, because it can be changed into a prime (225646543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757055 + ... + 757352.

It is an arithmetic number, because the mean of its divisors is an integer number (56790300).

Almost surely, 2^225646643 is an apocalyptic number.

225646643 is a deficient number, since it is larger than the sum of its proper divisors (1514557).

225646643 is a wasteful number, since it uses less digits than its factorization.

225646643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514556.

The product of its digits is 207360, while the sum is 38.

The square root of 225646643 is about 15021.5393019491. The cubic root of 225646643 is about 608.8023109001.

The spelling of 225646643 in words is "two hundred twenty-five million, six hundred forty-six thousand, six hundred forty-three".