260640811 has 2 divisors, whose sum is σ = 260640812. Its totient is φ = 260640810.

The previous prime is 260640791. The next prime is 260640817. The reversal of 260640811 is 118046062.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260640811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260640811.

It is not a weakly prime, because it can be changed into another prime (260640817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130320405 + 130320406.

It is an arithmetic number, because the mean of its divisors is an integer number (130320406).

Almost surely, 2^260640811 is an apocalyptic number.

260640811 is a deficient number, since it is larger than the sum of its proper divisors (1).

260640811 is an equidigital number, since it uses as much as digits as its factorization.

260640811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 260640811 is about 16144.3739736169. The cubic root of 260640811 is about 638.7743559658.

Adding to 260640811 its reverse (118046062), we get a palindrome (378686873).

The spelling of 260640811 in words is "two hundred sixty million, six hundred forty thousand, eight hundred eleven".