216538025 has 24 divisors (see below), whose sum is σ = 293728224. Its totient is φ = 157046400.

The previous prime is 216538013. The next prime is 216538039. The reversal of 216538025 is 520835612.

216538025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216538025 - 2¹⁰ = 216537001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216537982 and 216538000.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 124814 + ... + 126536.

It is an arithmetic number, because the mean of its divisors is an integer number (12238676).

Almost surely, 2^216538025 is an apocalyptic number.

216538025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216538025 is a deficient number, since it is larger than the sum of its proper divisors (77190199).

216538025 is a wasteful number, since it uses less digits than its factorization.

216538025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201 (or 2196 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 216538025 is about 14715.2310549308. The cubic root of 216538025 is about 600.4977582433.

The spelling of 216538025 in words is "two hundred sixteen million, five hundred thirty-eight thousand, twenty-five".