264565649 has 2 divisors, whose sum is σ = 264565650. Its totient is φ = 264565648.

The previous prime is 264565643. The next prime is 264565669. The reversal of 264565649 is 946565462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183115024 + 81450625 = 13532^2 + 9025^2 .

It is a cyclic number.

It is not a de Polignac number, because 264565649 - 2⁸ = 264565393 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 (264565643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132282824 + 132282825.

It is an arithmetic number, because the mean of its divisors is an integer number (132282825).

Almost surely, 2^264565649 is an apocalyptic number.

It is an amenable number.

264565649 is a deficient number, since it is larger than the sum of its proper divisors (1).

264565649 is an equidigital number, since it uses as much as digits as its factorization.

264565649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 47.

The square root of 264565649 is about 16265.4741400305. The cubic root of 264565649 is about 641.9647054739.

The spelling of 264565649 in words is "two hundred sixty-four million, five hundred sixty-five thousand, six hundred forty-nine".