3555550508221 has 2 divisors, whose sum is σ = 3555550508222. Its totient is φ = 3555550508220.

The previous prime is 3555550508177. The next prime is 3555550508227. The reversal of 3555550508221 is 1228050555553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2693783625625 + 861766882596 = 1641275^2 + 928314^2 .

It is a cyclic number.

It is not a de Polignac number, because 3555550508221 - 2¹⁵ = 3555550475453 is a prime.

It is a super-2 number, since 2×3555550508221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3555550508227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1777775254110 + 1777775254111.

It is an arithmetic number, because the mean of its divisors is an integer number (1777775254111).

Almost surely, 2^{3555550508221} is an apocalyptic number.

It is an amenable number.

3555550508221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3555550508221 is an equidigital number, since it uses as much as digits as its factorization.

3555550508221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500000, while the sum is 46.

The spelling of 3555550508221 in words is "three trillion, five hundred fifty-five billion, five hundred fifty million, five hundred eight thousand, two hundred twenty-one".