643222655321341 has 12 divisors (see below), whose sum is σ = 655839205044660. Its totient is φ = 630844483393280.

The previous prime is 643222655321317. The next prime is 643222655321347. The reversal of 643222655321341 is 143123556222346.

It can be written as a sum of positive squares in 6 ways, for example, as 101405322940441 + 541817332380900 = 10070021^2 + 23276970^2 .

It is not a de Polignac number, because 643222655321341 - 2³¹ = 643220507837693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643222655321347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36555250 + ... + 51212611.

It is an arithmetic number, because the mean of its divisors is an integer number (54653267087055).

Almost surely, 2^{643222655321341} is an apocalyptic number.

It is an amenable number.

643222655321341 is a deficient number, since it is larger than the sum of its proper divisors (12616549723319).

643222655321341 is an equidigital number, since it uses as much as digits as its factorization.

643222655321341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87770576 (or 87770523 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 49.

The spelling of 643222655321341 in words is "six hundred forty-three trillion, two hundred twenty-two billion, six hundred fifty-five million, three hundred twenty-one thousand, three hundred forty-one".