643446611212 has 12 divisors (see below), whose sum is σ = 1127389876480. Its totient is φ = 321335217936.

The previous prime is 643446611209. The next prime is 643446611221. The reversal of 643446611212 is 212116644346.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97018188 + ... + 97024819.

Almost surely, 2^643446611212 is an apocalyptic number.

It is an amenable number.

643446611212 is a deficient number, since it is larger than the sum of its proper divisors (483943265268).

643446611212 is a wasteful number, since it uses less digits than its factorization.

643446611212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194043840 (or 194043838 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The spelling of 643446611212 in words is "six hundred forty-three billion, four hundred forty-six million, six hundred eleven thousand, two hundred twelve".