643540045306 has 8 divisors (see below), whose sum is σ = 988854216084. Its totient is φ = 313921973280.

The previous prime is 643540045303. The next prime is 643540045327. The reversal of 643540045306 is 603540045346.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 643539279681 + 765625 = 802209^2 + 875^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (643540045303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3924024585 + ... + 3924024748.

Almost surely, 2^643540045306 is an apocalyptic number.

643540045306 is a deficient number, since it is larger than the sum of its proper divisors (345314170778).

643540045306 is a wasteful number, since it uses less digits than its factorization.

643540045306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848049376.

The product of its (nonzero) digits is 518400, while the sum is 40.

Adding to 643540045306 its sum of digits (40), we get a palindrome (643540045346).

The spelling of 643540045306 in words is "six hundred forty-three billion, five hundred forty million, forty-five thousand, three hundred six".