164660225 has 12 divisors (see below), whose sum is σ = 205312380. Its totient is φ = 130996800.

The previous prime is 164660219. The next prime is 164660227. The reversal of 164660225 is 522066461.

It is a Cunningham number, because it is equal to 12832²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 5193841 + 159466384 = 2279^2 + 12628^2 .

It is not a de Polignac number, because 164660225 - 2⁶ = 164660161 is a prime.

It is a super-2 number, since 2×164660225² = 54225979394101250, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 164660191 and 164660200.

It is not an unprimeable number, because it can be changed into a prime (164660227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13670 + ... + 22719.

It is an arithmetic number, because the mean of its divisors is an integer number (17109365).

Almost surely, 2^164660225 is an apocalyptic number.

It is an amenable number.

164660225 is a deficient number, since it is larger than the sum of its proper divisors (40652155).

164660225 is a wasteful number, since it uses less digits than its factorization.

164660225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36580 (or 36575 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 164660225 is about 12832.0000389651. Note that the first 4 decimals coincide. The cubic root of 164660225 is about 548.1039116446.

The spelling of 164660225 in words is "one hundred sixty-four million, six hundred sixty thousand, two hundred twenty-five".