201665225 has 12 divisors (see below), whose sum is σ = 250539024. Its totient is φ = 161026320.

The previous prime is 201665179. The next prime is 201665251. The reversal of 201665225 is 522566102.

It is not a de Polignac number, because 201665225 - 2¹⁰ = 201664201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6302 + ... + 21048.

It is an arithmetic number, because the mean of its divisors is an integer number (20878252).

Almost surely, 2^201665225 is an apocalyptic number.

201665225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

201665225 is a deficient number, since it is larger than the sum of its proper divisors (48873799).

201665225 is a wasteful number, since it uses less digits than its factorization.

201665225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15304 (or 15299 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 201665225 is about 14200.8881764487. Note that the first 3 decimals coincide. The cubic root of 201665225 is about 586.4221129401.

The spelling of 201665225 in words is "two hundred one million, six hundred sixty-five thousand, two hundred twenty-five".