6665261 has 2 divisors, whose sum is σ = 6665262. Its totient is φ = 6665260.

The previous prime is 6665249. The next prime is 6665297. The reversal of 6665261 is 1625666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5522500 + 1142761 = 2350^2 + 1069^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665261 - 2¹⁰ = 6664237 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₄₅₅₂₉₇ and since 6665261 and 455297 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6665201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332630 + 3332631.

It is an arithmetic number, because the mean of its divisors is an integer number (3332631).

Almost surely, 2^6665261 is an apocalyptic number.

It is an amenable number.

6665261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665261 is an equidigital number, since it uses as much as digits as its factorization.

6665261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 6665261 is about 2581.7166769419. The cubic root of 6665261 is about 188.1939770166.

The spelling of 6665261 in words is "six million, six hundred sixty-five thousand, two hundred sixty-one".