643949044593 has 8 divisors (see below), whose sum is σ = 858705962400. Its totient is φ = 429245744928.

The previous prime is 643949044579. The next prime is 643949044603. The reversal of 643949044593 is 395440949346.

It is a happy number.

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

It is not a de Polignac number, because 643949044593 - 2¹⁴ = 643949028209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643949044573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13376503 + ... + 13424556.

It is an arithmetic number, because the mean of its divisors is an integer number (107338245300).

Almost surely, 2^643949044593 is an apocalyptic number.

It is an amenable number.

643949044593 is a deficient number, since it is larger than the sum of its proper divisors (214756917807).

643949044593 is a wasteful number, since it uses less digits than its factorization.

643949044593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26809071.

The product of its (nonzero) digits is 50388480, while the sum is 60.

The spelling of 643949044593 in words is "six hundred forty-three billion, nine hundred forty-nine million, forty-four thousand, five hundred ninety-three".