15560552221 has 2 divisors, whose sum is σ = 15560552222. Its totient is φ = 15560552220.

The previous prime is 15560552219. The next prime is 15560552233. The reversal of 15560552221 is 12225506551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12116505625 + 3444046596 = 110075^2 + 58686^2 .

It is a cyclic number.

It is not a de Polignac number, because 15560552221 - 2¹ = 15560552219 is a prime.

Together with 15560552219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15560552261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780276110 + 7780276111.

It is an arithmetic number, because the mean of its divisors is an integer number (7780276111).

Almost surely, 2^15560552221 is an apocalyptic number.

It is an amenable number.

15560552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15560552221 is an equidigital number, since it uses as much as digits as its factorization.

15560552221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 15560552221 in words is "fifteen billion, five hundred sixty million, five hundred fifty-two thousand, two hundred twenty-one".