5661650221 has 16 divisors (see below), whose sum is σ = 5839626240. Its totient is φ = 5486261760.

The previous prime is 5661650179. The next prime is 5661650231. The reversal of 5661650221 is 1220561665.

It is a cyclic number.

It is not a de Polignac number, because 5661650221 - 2¹¹ = 5661648173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661650231) 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 15 ways as a sum of consecutive naturals, for example, 5544691 + ... + 5545711.

It is an arithmetic number, because the mean of its divisors is an integer number (364976640).

Almost surely, 2^5661650221 is an apocalyptic number.

It is an amenable number.

5661650221 is a deficient number, since it is larger than the sum of its proper divisors (177976019).

5661650221 is a wasteful number, since it uses less digits than its factorization.

5661650221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 5661650221 is about 75243.9381013514. The cubic root of 5661650221 is about 1782.3008394978.

The spelling of 5661650221 in words is "five billion, six hundred sixty-one million, six hundred fifty thousand, two hundred twenty-one".