643008430266 has 16 divisors (see below), whose sum is σ = 1286076610944. Its totient is φ = 214326185024.

The previous prime is 643008430217. The next prime is 643008430303. The reversal of 643008430266 is 662034800346.

It is a happy number.

It is an unprimeable number.

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, 2349090 + ... + 2608493.

It is an arithmetic number, because the mean of its divisors is an integer number (80379788184).

Almost surely, 2^643008430266 is an apocalyptic number.

643008430266 is an abundant number, since it is smaller than the sum of its proper divisors (643068180678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643008430266 is a wasteful number, since it uses less digits than its factorization.

643008430266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979205.

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 643008430266 in words is "six hundred forty-three billion, eight million, four hundred thirty thousand, two hundred sixty-six".