1265263981237 has 2 divisors, whose sum is σ = 1265263981238. Its totient is φ = 1265263981236.

The previous prime is 1265263981169. The next prime is 1265263981249. The reversal of 1265263981237 is 7321893625621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1253893811076 + 11370170161 = 1119774^2 + 106631^2 .

It is an emirp because it is prime and its reverse (7321893625621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265263981237 - 2³¹ = 1263116497589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265263982237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632631990618 + 632631990619.

It is an arithmetic number, because the mean of its divisors is an integer number (632631990619).

Almost surely, 2^{1265263981237} is an apocalyptic number.

It is an amenable number.

1265263981237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265263981237 is an equidigital number, since it uses as much as digits as its factorization.

1265263981237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 55.

The spelling of 1265263981237 in words is "one trillion, two hundred sixty-five billion, two hundred sixty-three million, nine hundred eighty-one thousand, two hundred thirty-seven".