643251211112 has 64 divisors (see below), whose sum is σ = 1303816849920. Its totient is φ = 296383546368.

The previous prime is 643251211091. The next prime is 643251211177. The reversal of 643251211112 is 211112152346.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3418673 + ... + 3601919.

It is an arithmetic number, because the mean of its divisors is an integer number (20372138280).

Almost surely, 2^643251211112 is an apocalyptic number.

It is an amenable number.

643251211112 is an abundant number, since it is smaller than the sum of its proper divisors (660565638808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643251211112 is a wasteful number, since it uses less digits than its factorization.

643251211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183810 (or 183806 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

Adding to 643251211112 its reverse (211112152346), we get a palindrome (854363363458).

The spelling of 643251211112 in words is "six hundred forty-three billion, two hundred fifty-one million, two hundred eleven thousand, one hundred twelve".