215544464225 has 6 divisors (see below), whose sum is σ = 267275135670. Its totient is φ = 172435571360.

The previous prime is 215544464221. The next prime is 215544464243. The reversal of 215544464225 is 522464445512.

It is a happy number.

215544464225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 45100167424 + 170444296801 = 212368^2 + 412849^2 .

It is not a de Polignac number, because 215544464225 - 2² = 215544464221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215544464221) 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 5 ways as a sum of consecutive naturals, for example, 4310889260 + ... + 4310889309.

It is an arithmetic number, because the mean of its divisors is an integer number (44545855945).

Almost surely, 2^215544464225 is an apocalyptic number.

215544464225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215544464225 is a deficient number, since it is larger than the sum of its proper divisors (51730671445).

215544464225 is an equidigital number, since it uses as much as digits as its factorization.

215544464225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8621778579 (or 8621778574 counting only the distinct ones).

The product of its digits is 1536000, while the sum is 44.

The spelling of 215544464225 in words is "two hundred fifteen billion, five hundred forty-four million, four hundred sixty-four thousand, two hundred twenty-five".