643472375701 has 4 divisors (see below), whose sum is σ = 644761900000. Its totient is φ = 642182851404.

The previous prime is 643472375683. The next prime is 643472375737. The reversal of 643472375701 is 107573274346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643472375701 - 2²⁹ = 642935504789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643472375771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644761401 + ... + 644762398.

It is an arithmetic number, because the mean of its divisors is an integer number (161190475000).

Almost surely, 2^643472375701 is an apocalyptic number.

It is an amenable number.

643472375701 is a deficient number, since it is larger than the sum of its proper divisors (1289524299).

643472375701 is a wasteful number, since it uses less digits than its factorization.

643472375701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289524298.

The product of its (nonzero) digits is 2963520, while the sum is 49.

The spelling of 643472375701 in words is "six hundred forty-three billion, four hundred seventy-two million, three hundred seventy-five thousand, seven hundred one".