643311355205 has 8 divisors (see below), whose sum is σ = 774760536312. Its totient is φ = 512791144128.

The previous prime is 643311355199. The next prime is 643311355217. The reversal of 643311355205 is 502553113346.

It can be written as a sum of positive squares in 4 ways, for example, as 39198456196 + 604112899009 = 197986^2 + 777247^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 643311355205 - 2³⁴ = 626131486021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232240982 + ... + 232243751.

It is an arithmetic number, because the mean of its divisors is an integer number (96845067039).

Almost surely, 2^643311355205 is an apocalyptic number.

It is an amenable number.

643311355205 is a deficient number, since it is larger than the sum of its proper divisors (131449181107).

643311355205 is a wasteful number, since it uses less digits than its factorization.

643311355205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464485015.

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 643311355205 in words is "six hundred forty-three billion, three hundred eleven million, three hundred fifty-five thousand, two hundred five".