215454425225 has 12 divisors (see below), whose sum is σ = 287714525196. Its totient is φ = 159104806080.

The previous prime is 215454425183. The next prime is 215454425237. The reversal of 215454425225 is 522524454512.

It can be written as a sum of positive squares in 6 ways, for example, as 91604041 + 215362821184 = 9571^2 + 464072^2 .

It is not a de Polignac number, because 215454425225 - 2¹² = 215454421129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331468022 + ... + 331468671.

It is an arithmetic number, because the mean of its divisors is an integer number (23976210433).

Almost surely, 2^215454425225 is an apocalyptic number.

215454425225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215454425225 is a deficient number, since it is larger than the sum of its proper divisors (72260099971).

215454425225 is a wasteful number, since it uses less digits than its factorization.

215454425225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662936716 (or 662936711 counting only the distinct ones).

The product of its digits is 640000, while the sum is 41.

Adding to 215454425225 its reverse (522524454512), we get a palindrome (737978879737).

The spelling of 215454425225 in words is "two hundred fifteen billion, four hundred fifty-four million, four hundred twenty-five thousand, two hundred twenty-five".