216406325 has 6 divisors (see below), whose sum is σ = 268343874. Its totient is φ = 173125040.

The previous prime is 216406291. The next prime is 216406339. The reversal of 216406325 is 523604612.

216406325 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 8844676 + 207561649 = 2974^2 + 14407^2 .

It is not a de Polignac number, because 216406325 - 2²⁴ = 199629109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4328102 + ... + 4328151.

It is an arithmetic number, because the mean of its divisors is an integer number (44723979).

Almost surely, 2^216406325 is an apocalyptic number.

216406325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216406325 is a deficient number, since it is larger than the sum of its proper divisors (51937549).

216406325 is an equidigital number, since it uses as much as digits as its factorization.

216406325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8656263 (or 8656258 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 216406325 is about 14710.7554190803. The cubic root of 216406325 is about 600.3759911870.

The spelling of 216406325 in words is "two hundred sixteen million, four hundred six thousand, three hundred twenty-five".