3555221355 has 32 divisors (see below), whose sum is σ = 7223308800. Its totient is φ = 1625243616.

The previous prime is 3555221353. The next prime is 3555221357. The reversal of 3555221355 is 5531225553.

3555221355 is a `hidden beast` number, since 35 + 55 + 221 + 355 = 666.

It is an interprime number because it is at equal distance from previous prime (3555221353) and next prime (3555221357).

It is not a de Polignac number, because 3555221355 - 2¹ = 3555221353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3555221353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1880125 + ... + 1882014.

It is an arithmetic number, because the mean of its divisors is an integer number (225728400).

Almost surely, 2^3555221355 is an apocalyptic number.

3555221355 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3555221355 is an abundant number, since it is smaller than the sum of its proper divisors (3668087445).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3555221355 is a wasteful number, since it uses less digits than its factorization.

3555221355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762160 (or 3762154 counting only the distinct ones).

The product of its digits is 112500, while the sum is 36.

The square root of 3555221355 is about 59625.6769772889. The cubic root of 3555221355 is about 1526.2378347224.

The spelling of 3555221355 in words is "three billion, five hundred fifty-five million, two hundred twenty-one thousand, three hundred fifty-five".