643326265 has 32 divisors (see below), whose sum is σ = 804816000. Its totient is φ = 493413888.

The previous prime is 643326253. The next prime is 643326283. The reversal of 643326265 is 562623346.

It is a cyclic number.

It is not a de Polignac number, because 643326265 - 2²⁹ = 106455353 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 2809171 + ... + 2809399.

It is an arithmetic number, because the mean of its divisors is an integer number (25150500).

Almost surely, 2^643326265 is an apocalyptic number.

It is an amenable number.

643326265 is a deficient number, since it is larger than the sum of its proper divisors (161489735).

643326265 is a wasteful number, since it uses less digits than its factorization.

643326265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

The product of its digits is 155520, while the sum is 37.

The square root of 643326265 is about 25363.8771681303. The cubic root of 643326265 is about 863.2642596490.

The spelling of 643326265 in words is "six hundred forty-three million, three hundred twenty-six thousand, two hundred sixty-five".