8020533643 has 4 divisors (see below), whose sum is σ = 8020713960. Its totient is φ = 8020353328.

The previous prime is 8020533637. The next prime is 8020533709. The reversal of 8020533643 is 3463350208.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8020533643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8020533599 and 8020533608.

It is not an unprimeable number, because it can be changed into a prime (8020530643) 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, 29496 + ... + 130042.

It is an arithmetic number, because the mean of its divisors is an integer number (2005178490).

Almost surely, 2^8020533643 is an apocalyptic number.

8020533643 is a deficient number, since it is larger than the sum of its proper divisors (180317).

8020533643 is a wasteful number, since it uses less digits than its factorization.

8020533643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180316.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 8020533643 is about 89557.4320924847. The cubic root of 8020533643 is about 2001.7096750059.

The spelling of 8020533643 in words is "eight billion, twenty million, five hundred thirty-three thousand, six hundred forty-three".