4221564661 has 8 divisors (see below), whose sum is σ = 4473045720. Its totient is φ = 3970434048.

The previous prime is 4221564649. The next prime is 4221564671. The reversal of 4221564661 is 1664651224.

It can be written as a sum of positive squares in 4 ways, for example, as 463761 + 4221100900 = 681^2 + 64970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4221564661 - 2¹¹ = 4221562613 is a prime.

It is a super-3 number, since 3×4221564661³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4221564661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221564671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62596 + ... + 111181.

It is an arithmetic number, because the mean of its divisors is an integer number (559130715).

Almost surely, 2^4221564661 is an apocalyptic number.

It is an amenable number.

4221564661 is a deficient number, since it is larger than the sum of its proper divisors (251481059).

4221564661 is a wasteful number, since it uses less digits than its factorization.

4221564661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175223.

The product of its digits is 69120, while the sum is 37.

The square root of 4221564661 is about 64973.5689415319. The cubic root of 4221564661 is about 1616.1852859806.

The spelling of 4221564661 in words is "four billion, two hundred twenty-one million, five hundred sixty-four thousand, six hundred sixty-one".