12747565261 has 2 divisors, whose sum is σ = 12747565262. Its totient is φ = 12747565260.

The previous prime is 12747565157. The next prime is 12747565279. The reversal of 12747565261 is 16256574721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12657600036 + 89965225 = 112506^2 + 9485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12747565261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12747565561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6373782630 + 6373782631.

It is an arithmetic number, because the mean of its divisors is an integer number (6373782631).

Almost surely, 2^12747565261 is an apocalyptic number.

It is an amenable number.

12747565261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12747565261 is an equidigital number, since it uses as much as digits as its factorization.

12747565261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 46.

The spelling of 12747565261 in words is "twelve billion, seven hundred forty-seven million, five hundred sixty-five thousand, two hundred sixty-one".