260878497721 has 2 divisors, whose sum is σ = 260878497722. Its totient is φ = 260878497720.

The previous prime is 260878497611. The next prime is 260878497799. The reversal of 260878497721 is 127794878062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245782935225 + 15095562496 = 495765^2 + 122864^2 .

It is a cyclic number.

It is not a de Polignac number, because 260878497721 - 2¹¹ = 260878495673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260878497721.

It is not a weakly prime, because it can be changed into another prime (260878498721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130439248860 + 130439248861.

It is an arithmetic number, because the mean of its divisors is an integer number (130439248861).

Almost surely, 2^260878497721 is an apocalyptic number.

It is an amenable number.

260878497721 is a deficient number, since it is larger than the sum of its proper divisors (1).

260878497721 is an equidigital number, since it uses as much as digits as its factorization.

260878497721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18966528, while the sum is 61.

The spelling of 260878497721 in words is "two hundred sixty billion, eight hundred seventy-eight million, four hundred ninety-seven thousand, seven hundred twenty-one".