1247765287441 has 2 divisors, whose sum is σ = 1247765287442. Its totient is φ = 1247765287440.

The previous prime is 1247765287397. The next prime is 1247765287481. The reversal of 1247765287441 is 1447825677421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 965740563841 + 282024723600 = 982721^2 + 531060^2 .

It is a cyclic number.

It is not a de Polignac number, because 1247765287441 - 2¹⁷ = 1247765156369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247765287481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623882643720 + 623882643721.

It is an arithmetic number, because the mean of its divisors is an integer number (623882643721).

Almost surely, 2^{1247765287441} is an apocalyptic number.

It is an amenable number.

1247765287441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247765287441 is an equidigital number, since it uses as much as digits as its factorization.

1247765287441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21073920, while the sum is 58.

The spelling of 1247765287441 in words is "one trillion, two hundred forty-seven billion, seven hundred sixty-five million, two hundred eighty-seven thousand, four hundred forty-one".