643743221059 has 16 divisors (see below), whose sum is σ = 689643825280. Its totient is φ = 600759152136.

The previous prime is 643743221057. The next prime is 643743221081. The reversal of 643743221059 is 950122347346.

It is not a de Polignac number, because 643743221059 - 2¹ = 643743221057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643743221057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240849 + ... + 1159954.

It is an arithmetic number, because the mean of its divisors is an integer number (43102739080).

Almost surely, 2^643743221059 is an apocalyptic number.

643743221059 is a deficient number, since it is larger than the sum of its proper divisors (45900604221).

643743221059 is an equidigital number, since it uses as much as digits as its factorization.

643743221059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400927 (or 1400889 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 643743221059 in words is "six hundred forty-three billion, seven hundred forty-three million, two hundred twenty-one thousand, fifty-nine".