8221587653 has 4 divisors (see below), whose sum is σ = 8225114028. Its totient is φ = 8218061280.

The previous prime is 8221587643. The next prime is 8221587691. The reversal of 8221587653 is 3567851228.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4927057249 + 3294530404 = 70193^2 + 57398^2 .

It is a cyclic number.

It is not a de Polignac number, because 8221587653 - 2¹⁰ = 8221586629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8221587598 and 8221587607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221587623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1759688 + ... + 1764353.

It is an arithmetic number, because the mean of its divisors is an integer number (2056278507).

Almost surely, 2^8221587653 is an apocalyptic number.

It is an amenable number.

8221587653 is a deficient number, since it is larger than the sum of its proper divisors (3526375).

8221587653 is a wasteful number, since it uses less digits than its factorization.

8221587653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3526374.

The product of its digits is 806400, while the sum is 47.

The square root of 8221587653 is about 90672.9709064394. The cubic root of 8221587653 is about 2018.2977238836.

The spelling of 8221587653 in words is "eight billion, two hundred twenty-one million, five hundred eighty-seven thousand, six hundred fifty-three".