643502330245 has 8 divisors (see below), whose sum is σ = 776203848216. Its totient is φ = 512134496256.

The previous prime is 643502330221. The next prime is 643502330333. The reversal of 643502330245 is 542033205346.

643502330245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 25508242369 + 617994087876 = 159713^2 + 786126^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 643502330245 - 2²³ = 643493941637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333419932 + ... + 333421861.

It is an arithmetic number, because the mean of its divisors is an integer number (97025481027).

Almost surely, 2^643502330245 is an apocalyptic number.

It is an amenable number.

643502330245 is a deficient number, since it is larger than the sum of its proper divisors (132701517971).

643502330245 is a wasteful number, since it uses less digits than its factorization.

643502330245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666841991.

The product of its (nonzero) digits is 259200, while the sum is 37.

The spelling of 643502330245 in words is "six hundred forty-three billion, five hundred two million, three hundred thirty thousand, two hundred forty-five".