643785587345 has 8 divisors (see below), whose sum is σ = 772917192576. Its totient is φ = 514778811376.

The previous prime is 643785587317. The next prime is 643785587363. The reversal of 643785587345 is 543785587346.

643785587345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643785587345 - 2⁶ = 643785587281 is a prime.

It is a Duffinian 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, 31195967 + ... + 31216596.

It is an arithmetic number, because the mean of its divisors is an integer number (96614649072).

Almost surely, 2^643785587345 is an apocalyptic number.

It is an amenable number.

643785587345 is a deficient number, since it is larger than the sum of its proper divisors (129131605231).

643785587345 is a wasteful number, since it uses less digits than its factorization.

643785587345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62414631.

The product of its digits is 338688000, while the sum is 65.

Subtracting from 643785587345 its reverse (543785587346), we obtain a palindrome (99999999999).

The spelling of 643785587345 in words is "six hundred forty-three billion, seven hundred eighty-five million, five hundred eighty-seven thousand, three hundred forty-five".