265649689 has 2 divisors, whose sum is σ = 265649690. Its totient is φ = 265649688.

The previous prime is 265649651. The next prime is 265649719. The reversal of 265649689 is 986946562.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231040000 + 34609689 = 15200^2 + 5883^2 .

It is a cyclic number.

It is not a de Polignac number, because 265649689 - 2²¹ = 263552537 is a prime.

It is not a weakly prime, because it can be changed into another prime (265640689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132824844 + 132824845.

It is an arithmetic number, because the mean of its divisors is an integer number (132824845).

Almost surely, 2^265649689 is an apocalyptic number.

It is an amenable number.

265649689 is a deficient number, since it is larger than the sum of its proper divisors (1).

265649689 is an equidigital number, since it uses as much as digits as its factorization.

265649689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 55.

The square root of 265649689 is about 16298.7634193518. The cubic root of 265649689 is about 642.8403130856.

The spelling of 265649689 in words is "two hundred sixty-five million, six hundred forty-nine thousand, six hundred eighty-nine".