1361260736261 has 2 divisors, whose sum is σ = 1361260736262. Its totient is φ = 1361260736260.

The previous prime is 1361260736257. The next prime is 1361260736287. The reversal of 1361260736261 is 1626370621631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1076644888225 + 284615848036 = 1037615^2 + 533494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361260736261 - 2² = 1361260736257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1361260736291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680630368130 + 680630368131.

It is an arithmetic number, because the mean of its divisors is an integer number (680630368131).

Almost surely, 2^{1361260736261} is an apocalyptic number.

It is an amenable number.

1361260736261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361260736261 is an equidigital number, since it uses as much as digits as its factorization.

1361260736261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 1361260736261 in words is "one trillion, three hundred sixty-one billion, two hundred sixty million, seven hundred thirty-six thousand, two hundred sixty-one".