215564055 has 32 divisors (see below), whose sum is σ = 396486144. Its totient is φ = 97965696.

The previous prime is 215564033. The next prime is 215564059. The reversal of 215564055 is 550465512.

It is not a de Polignac number, because 215564055 - 2¹⁴ = 215547671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215564059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12232 + ... + 24098.

It is an arithmetic number, because the mean of its divisors is an integer number (12390192).

Almost surely, 2^215564055 is an apocalyptic number.

215564055 is a deficient number, since it is larger than the sum of its proper divisors (180922089).

215564055 is a wasteful number, since it uses less digits than its factorization.

215564055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12055.

The product of its (nonzero) digits is 30000, while the sum is 33.

The square root of 215564055 is about 14682.0998157620. The cubic root of 215564055 is about 599.5960753580.

The spelling of 215564055 in words is "two hundred fifteen million, five hundred sixty-four thousand, fifty-five".