643245411311 has 4 divisors (see below), whose sum is σ = 658934323824. Its totient is φ = 627556498800.

The previous prime is 643245411299. The next prime is 643245411313. The reversal of 643245411311 is 113114542346.

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

It is a cyclic number.

It is not a de Polignac number, because 643245411311 - 2¹⁴ = 643245394927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643245411313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7844456195 + ... + 7844456276.

It is an arithmetic number, because the mean of its divisors is an integer number (164733580956).

Almost surely, 2^643245411311 is an apocalyptic number.

643245411311 is a deficient number, since it is larger than the sum of its proper divisors (15688912513).

643245411311 is a wasteful number, since it uses less digits than its factorization.

643245411311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15688912512.

The product of its digits is 34560, while the sum is 35.

Adding to 643245411311 its reverse (113114542346), we get a palindrome (756359953657).

The spelling of 643245411311 in words is "six hundred forty-three billion, two hundred forty-five million, four hundred eleven thousand, three hundred eleven".