643566244432 has 40 divisors (see below), whose sum is σ = 1272372000480. Its totient is φ = 315249413760.

The previous prime is 643566244411. The next prime is 643566244441. The reversal of 643566244432 is 234442665346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886794 + ... + 1439977.

It is an arithmetic number, because the mean of its divisors is an integer number (31809300012).

Almost surely, 2^643566244432 is an apocalyptic number.

It is an amenable number.

643566244432 is a deficient number, since it is larger than the sum of its proper divisors (628805756048).

643566244432 is a wasteful number, since it uses less digits than its factorization.

643566244432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2327131 (or 2327125 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 49.

The spelling of 643566244432 in words is "six hundred forty-three billion, five hundred sixty-six million, two hundred forty-four thousand, four hundred thirty-two".