643655220347006 has 16 divisors (see below), whose sum is σ = 1168315357941216. Its totient is φ = 259625635097856.

The previous prime is 643655220347003. The next prime is 643655220347011. The reversal of 643655220347006 is 600743022556346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643655220347003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1352216849231 + ... + 1352216849706.

It is an arithmetic number, because the mean of its divisors is an integer number (73019709871326).

Almost surely, 2^{643655220347006} is an apocalyptic number.

643655220347006 is a deficient number, since it is larger than the sum of its proper divisors (524660137594210).

643655220347006 is a wasteful number, since it uses less digits than its factorization.

643655220347006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2704433698963.

The product of its (nonzero) digits is 21772800, while the sum is 53.

The spelling of 643655220347006 in words is "six hundred forty-three trillion, six hundred fifty-five billion, two hundred twenty million, three hundred forty-seven thousand, six".