643551014 has 16 divisors (see below), whose sum is σ = 1075906800. Its totient is φ = 286907904.

The previous prime is 643551011. The next prime is 643551023. The reversal of 643551014 is 410155346.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643551011) 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 7 ways as a sum of consecutive naturals, for example, 497459 + ... + 498750.

It is an arithmetic number, because the mean of its divisors is an integer number (67244175).

Almost surely, 2^643551014 is an apocalyptic number.

643551014 is a deficient number, since it is larger than the sum of its proper divisors (432355786).

643551014 is a wasteful number, since it uses less digits than its factorization.

643551014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996247.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 643551014 is about 25368.3072750233. The cubic root of 643551014 is about 863.3647763957.

The spelling of 643551014 in words is "six hundred forty-three million, five hundred fifty-one thousand, fourteen".