8021055643 has 4 divisors (see below), whose sum is σ = 8021879080. Its totient is φ = 8020232208.

The previous prime is 8021055589. The next prime is 8021055667. The reversal of 8021055643 is 3465501208.

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-8021055643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8021055599 and 8021055608.

It is not an unprimeable number, because it can be changed into a prime (8021055943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396930 + ... + 416647.

It is an arithmetic number, because the mean of its divisors is an integer number (2005469770).

Almost surely, 2^8021055643 is an apocalyptic number.

8021055643 is a deficient number, since it is larger than the sum of its proper divisors (823437).

8021055643 is an equidigital number, since it uses as much as digits as its factorization.

8021055643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823436.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 8021055643 is about 89560.3463760609. The cubic root of 8021055643 is about 2001.7530997882.

The spelling of 8021055643 in words is "eight billion, twenty-one million, fifty-five thousand, six hundred forty-three".