643170212 has 6 divisors (see below), whose sum is σ = 1125547878. Its totient is φ = 321585104.

The previous prime is 643170179. The next prime is 643170217. The reversal of 643170212 is 212071346.

It can be written as a sum of positive squares in only one way, i.e., 553943296 + 89226916 = 23536^2 + 9446^2 .

It is not an unprimeable number, because it can be changed into a prime (643170217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80396273 + ... + 80396280.

It is an arithmetic number, because the mean of its divisors is an integer number (187591313).

Almost surely, 2^643170212 is an apocalyptic number.

It is an amenable number.

643170212 is a deficient number, since it is larger than the sum of its proper divisors (482377666).

643170212 is a wasteful number, since it uses less digits than its factorization.

643170212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160792557 (or 160792555 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 643170212 is about 25360.8006971389. The cubic root of 643170212 is about 863.1944527309.

The spelling of 643170212 in words is "six hundred forty-three million, one hundred seventy thousand, two hundred twelve".