12784510261 has 2 divisors, whose sum is σ = 12784510262. Its totient is φ = 12784510260.

The previous prime is 12784510247. The next prime is 12784510309. The reversal of 12784510261 is 16201548721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12545344036 + 239166225 = 112006^2 + 15465^2 .

It is a cyclic number.

It is not a de Polignac number, because 12784510261 - 2⁵ = 12784510229 is a prime.

It is a super-2 number, since 2×12784510261² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12784510261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12784510201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392255130 + 6392255131.

It is an arithmetic number, because the mean of its divisors is an integer number (6392255131).

Almost surely, 2^12784510261 is an apocalyptic number.

It is an amenable number.

12784510261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784510261 is an equidigital number, since it uses as much as digits as its factorization.

12784510261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 12784510261 in words is "twelve billion, seven hundred eighty-four million, five hundred ten thousand, two hundred sixty-one".