264688649 has 2 divisors, whose sum is σ = 264688650. Its totient is φ = 264688648.

The previous prime is 264688603. The next prime is 264688687. The reversal of 264688649 is 946886462.

264688649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159769600 + 104919049 = 12640^2 + 10243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264688649 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264688649.

It is not a weakly prime, because it can be changed into another prime (264688049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132344324 + 132344325.

It is an arithmetic number, because the mean of its divisors is an integer number (132344325).

Almost surely, 2^264688649 is an apocalyptic number.

It is an amenable number.

264688649 is a deficient number, since it is larger than the sum of its proper divisors (1).

264688649 is an equidigital number, since it uses as much as digits as its factorization.

264688649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 53.

The square root of 264688649 is about 16269.2547155670. The cubic root of 264688649 is about 642.0641759651.

The spelling of 264688649 in words is "two hundred sixty-four million, six hundred eighty-eight thousand, six hundred forty-nine".