643556714 has 24 divisors (see below), whose sum is σ = 1050037920. Its totient is φ = 294992280.

The previous prime is 643556707. The next prime is 643556717. The reversal of 643556714 is 417655346.

It is not an unprimeable number, because it can be changed into a prime (643556717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27707 + ... + 45329.

It is an arithmetic number, because the mean of its divisors is an integer number (43751580).

Almost surely, 2^643556714 is an apocalyptic number.

643556714 is a deficient number, since it is larger than the sum of its proper divisors (406481206).

643556714 is a wasteful number, since it uses less digits than its factorization.

643556714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17706 (or 17675 counting only the distinct ones).

The product of its digits is 302400, while the sum is 41.

The square root of 643556714 is about 25368.4196196767. The cubic root of 643556714 is about 863.3673253595.

The spelling of 643556714 in words is "six hundred forty-three million, five hundred fifty-six thousand, seven hundred fourteen".