643476225 has 48 divisors (see below), whose sum is σ = 1219806848. Its totient is φ = 293207040.

The previous prime is 643476199. The next prime is 643476277. The reversal of 643476225 is 522674346.

It is not a de Polignac number, because 643476225 - 2⁶ = 643476161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 175107 + ... + 178743.

Almost surely, 2^643476225 is an apocalyptic number.

It is an amenable number.

643476225 is a deficient number, since it is larger than the sum of its proper divisors (576330623).

643476225 is a wasteful number, since it uses less digits than its factorization.

643476225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994 (or 3989 counting only the distinct ones).

The product of its digits is 241920, while the sum is 39.

The square root of 643476225 is about 25366.8331685293. The cubic root of 643476225 is about 863.3313303605.

The spelling of 643476225 in words is "six hundred forty-three million, four hundred seventy-six thousand, two hundred twenty-five".