643194066 has 8 divisors (see below), whose sum is σ = 1286388144. Its totient is φ = 214398020.

The previous prime is 643194007. The next prime is 643194073. The reversal of 643194066 is 660491346.

643194066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

643194066 is an admirable number.

It is a super-2 number, since 2×643194066² = 827397213075224712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53599500 + ... + 53599511.

It is an arithmetic number, because the mean of its divisors is an integer number (160798518).

Almost surely, 2^643194066 is an apocalyptic number.

643194066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

643194066 is a wasteful number, since it uses less digits than its factorization.

643194066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107199016.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 643194066 is about 25361.2709855007. The cubic root of 643194066 is about 863.2051240304.

The spelling of 643194066 in words is "six hundred forty-three million, one hundred ninety-four thousand, sixty-six".