643044232512 has 112 divisors (see below), whose sum is σ = 2062288382400. Its totient is φ = 194861882880.

The previous prime is 643044232477. The next prime is 643044232513. The reversal of 643044232512 is 215232440346.

643044232512 is a `hidden beast` number, since 64 + 304 + 42 + 3 + 251 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643044232513) by changing a digit.

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, 16896087 + ... + 16934102.

Almost surely, 2^643044232512 is an apocalyptic number.

It is an amenable number.

643044232512 is an abundant number, since it is smaller than the sum of its proper divisors (1419244149888).

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

643044232512 is a wasteful number, since it uses less digits than its factorization.

643044232512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33830221 (or 33830205 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 643044232512 its reverse (215232440346), we get a palindrome (858276672858).

The spelling of 643044232512 in words is "six hundred forty-three billion, forty-four million, two hundred thirty-two thousand, five hundred twelve".