643104243612 has 36 divisors (see below), whose sum is σ = 1625790002200. Its totient is φ = 214346272032.

The previous prime is 643104243589. The next prime is 643104243623. The reversal of 643104243612 is 216342401346.

643104243612 is a `hidden beast` number, since 6 + 4 + 3 + 10 + 4 + 24 + 3 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 547987 + ... + 1259562.

Almost surely, 2^643104243612 is an apocalyptic number.

It is an amenable number.

643104243612 is an abundant number, since it is smaller than the sum of its proper divisors (982685758588).

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

643104243612 is a wasteful number, since it uses less digits than its factorization.

643104243612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817442 (or 1817437 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 643104243612 its reverse (216342401346), we get a palindrome (859446644958).

The spelling of 643104243612 in words is "six hundred forty-three billion, one hundred four million, two hundred forty-three thousand, six hundred twelve".