643216842747 has 12 divisors (see below), whose sum is σ = 929132458800. Its totient is φ = 428792091408.

The previous prime is 643216842701. The next prime is 643216842797. The reversal of 643216842747 is 747248612346.

643216842747 is a `hidden beast` number, since 6 + 432 + 168 + 4 + 2 + 7 + 47 = 666.

It is not a de Polignac number, because 643216842747 - 2²⁴ = 643200065531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643216842693 and 643216842702.

It is not an unprimeable number, because it can be changed into a prime (643216842797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380372 + ... + 1786577.

It is an arithmetic number, because the mean of its divisors is an integer number (77427704900).

Almost surely, 2^643216842747 is an apocalyptic number.

643216842747 is a deficient number, since it is larger than the sum of its proper divisors (285915616053).

643216842747 is a wasteful number, since it uses less digits than its factorization.

643216842747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189522 (or 3189519 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 54.

The spelling of 643216842747 in words is "six hundred forty-three billion, two hundred sixteen million, eight hundred forty-two thousand, seven hundred forty-seven".