643452242746 has 4 divisors (see below), whose sum is σ = 965178364122. Its totient is φ = 321726121372.

The previous prime is 643452242737. The next prime is 643452242749. The reversal of 643452242746 is 647242254346.

643452242746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 538038387121 + 105413855625 = 733511^2 + 324675^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 643452242746.

It is not an unprimeable number, because it can be changed into a prime (643452242749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160863060685 + ... + 160863060688.

Almost surely, 2^643452242746 is an apocalyptic number.

643452242746 is a deficient number, since it is larger than the sum of its proper divisors (321726121376).

643452242746 is a wasteful number, since it uses less digits than its factorization.

643452242746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321726121375.

The product of its digits is 7741440, while the sum is 49.

The spelling of 643452242746 in words is "six hundred forty-three billion, four hundred fifty-two million, two hundred forty-two thousand, seven hundred forty-six".