643071565013 has 4 divisors (see below), whose sum is σ = 643134925728. Its totient is φ = 643008204300.

The previous prime is 643071564991. The next prime is 643071565027. The reversal of 643071565013 is 310565170346.

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 643071565013 - 2²⁰ = 643070516437 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 (643071565613) 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, 31665131 + ... + 31685432.

It is an arithmetic number, because the mean of its divisors is an integer number (160783731432).

Almost surely, 2^643071565013 is an apocalyptic number.

It is an amenable number.

643071565013 is a deficient number, since it is larger than the sum of its proper divisors (63360715).

643071565013 is a wasteful number, since it uses less digits than its factorization.

643071565013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63360714.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 643071565013 in words is "six hundred forty-three billion, seventy-one million, five hundred sixty-five thousand, thirteen".