16508225 has 6 divisors (see below), whose sum is σ = 20470230. Its totient is φ = 13206560.

The previous prime is 16508209. The next prime is 16508237. The reversal of 16508225 is 52280561.

It can be written as a sum of positive squares in 3 ways, for example, as 256 + 16507969 = 16^2 + 4063^2 .

It is not a de Polignac number, because 16508225 - 2⁴ = 16508209 is a prime.

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, 330140 + ... + 330189.

It is an arithmetic number, because the mean of its divisors is an integer number (3411705).

Almost surely, 2^16508225 is an apocalyptic number.

It is an amenable number.

16508225 is a deficient number, since it is larger than the sum of its proper divisors (3962005).

16508225 is an equidigital number, since it uses as much as digits as its factorization.

16508225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660339 (or 660334 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 16508225 is about 4063.0315036928. The cubic root of 16508225 is about 254.6244632405.

Adding to 16508225 its reverse (52280561), we get a palindrome (68788786).

The spelling of 16508225 in words is "sixteen million, five hundred eight thousand, two hundred twenty-five".