647643746212 has 12 divisors (see below), whose sum is σ = 1161019886796. Its totient is φ = 315923778560.

The previous prime is 647643746207. The next prime is 647643746317. The reversal of 647643746212 is 212647346746.

647643746212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 344644140096 + 302999606116 = 587064^2 + 550454^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 647643746212.

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, 1974523453 + ... + 1974523780.

It is an arithmetic number, because the mean of its divisors is an integer number (96751657233).

Almost surely, 2^647643746212 is an apocalyptic number.

It is an amenable number.

647643746212 is a deficient number, since it is larger than the sum of its proper divisors (513376140584).

647643746212 is a wasteful number, since it uses less digits than its factorization.

647643746212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949047278 (or 3949047276 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 52.

The spelling of 647643746212 in words is "six hundred forty-seven billion, six hundred forty-three million, seven hundred forty-six thousand, two hundred twelve".