643158326257567 has 4 divisors (see below), whose sum is σ = 643197781419336. Its totient is φ = 643118871095800.

The previous prime is 643158326257487. The next prime is 643158326257613. The reversal of 643158326257567 is 765752623851346.

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 643158326257567 - 2¹¹ = 643158326255519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643158326257496 and 643158326257505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643158326257267) 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, 19727556433 + ... + 19727589034.

It is an arithmetic number, because the mean of its divisors is an integer number (160799445354834).

Almost surely, 2^{643158326257567} is an apocalyptic number.

643158326257567 is a deficient number, since it is larger than the sum of its proper divisors (39455161769).

643158326257567 is a wasteful number, since it uses less digits than its factorization.

643158326257567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39455161768.

The product of its digits is 1524096000, while the sum is 70.

The spelling of 643158326257567 in words is "six hundred forty-three trillion, one hundred fifty-eight billion, three hundred twenty-six million, two hundred fifty-seven thousand, five hundred sixty-seven".