2665601 has 2 divisors, whose sum is σ = 2665602. Its totient is φ = 2665600.

The previous prime is 2665589. The next prime is 2665627. The reversal of 2665601 is 1065662.

It is an a-pointer prime, because the next prime (2665627) can be obtained adding 2665601 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2563201 + 102400 = 1601^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665601 - 2¹⁰ = 2664577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2665001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332800 + 1332801.

It is an arithmetic number, because the mean of its divisors is an integer number (1332801).

2^2665601 is an apocalyptic number.

It is an amenable number.

2665601 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665601 is an equidigital number, since it uses as much as digits as its factorization.

2665601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2665601 is about 1632.6668368041. Note that the first 3 decimals coincide. The cubic root of 2665601 is about 138.6537801090.

The spelling of 2665601 in words is "two million, six hundred sixty-five thousand, six hundred one".