643245704684 has 18 divisors (see below), whose sum is σ = 1237317668412. Its totient is φ = 292384411000.

The previous prime is 643245704683. The next prime is 643245704819. The reversal of 643245704684 is 486407542346.

643245704684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (643245704683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 664509542 + ... + 664510509.

Almost surely, 2^643245704684 is an apocalyptic number.

It is an amenable number.

643245704684 is a deficient number, since it is larger than the sum of its proper divisors (594071963728).

643245704684 is a wasteful number, since it uses less digits than its factorization.

643245704684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329020077 (or 1329020064 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 53.

The spelling of 643245704684 in words is "six hundred forty-three billion, two hundred forty-five million, seven hundred four thousand, six hundred eighty-four".