643196611 has 4 divisors (see below), whose sum is σ = 643270432. Its totient is φ = 643122792.

The previous prime is 643196579. The next prime is 643196639. The reversal of 643196611 is 116691346.

643196611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 116691346 = 2 ⋅58345673.

It is a cyclic number.

It is not a de Polignac number, because 643196611 - 2⁵ = 643196579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643196011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21771 + ... + 41956.

It is an arithmetic number, because the mean of its divisors is an integer number (160817608).

Almost surely, 2^643196611 is an apocalyptic number.

643196611 is a deficient number, since it is larger than the sum of its proper divisors (73821).

643196611 is a wasteful number, since it uses less digits than its factorization.

643196611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73820.

The product of its digits is 23328, while the sum is 37.

The square root of 643196611 is about 25361.3211603812. The cubic root of 643196611 is about 863.2062625432.

The spelling of 643196611 in words is "six hundred forty-three million, one hundred ninety-six thousand, six hundred eleven".