265011661 has 2 divisors, whose sum is σ = 265011662. Its totient is φ = 265011660.

The previous prime is 265011641. The next prime is 265011667. The reversal of 265011661 is 166110562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216972900 + 48038761 = 14730^2 + 6931^2 .

It is a cyclic number.

It is not a de Polignac number, because 265011661 - 2¹⁵ = 264978893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265011667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132505830 + 132505831.

It is an arithmetic number, because the mean of its divisors is an integer number (132505831).

Almost surely, 2^265011661 is an apocalyptic number.

It is an amenable number.

265011661 is a deficient number, since it is larger than the sum of its proper divisors (1).

265011661 is an equidigital number, since it uses as much as digits as its factorization.

265011661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 265011661 is about 16279.1787569275. The cubic root of 265011661 is about 642.3252501581.

The spelling of 265011661 in words is "two hundred sixty-five million, eleven thousand, six hundred sixty-one".