643091348897 has 4 divisors (see below), whose sum is σ = 643488565680. Its totient is φ = 642694132116.

The previous prime is 643091348873. The next prime is 643091348917. The reversal of 643091348897 is 798843190346.

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 643091348897 - 2⁶ = 643091348833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643091348827) 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, 198605963 + ... + 198609200.

It is an arithmetic number, because the mean of its divisors is an integer number (160872141420).

Almost surely, 2^643091348897 is an apocalyptic number.

It is an amenable number.

643091348897 is a deficient number, since it is larger than the sum of its proper divisors (397216783).

643091348897 is a wasteful number, since it uses less digits than its factorization.

643091348897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397216782.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 643091348897 in words is "six hundred forty-three billion, ninety-one million, three hundred forty-eight thousand, eight hundred ninety-seven".