1265264243381 has 2 divisors, whose sum is σ = 1265264243382. Its totient is φ = 1265264243380.

The previous prime is 1265264243371. The next prime is 1265264243387. The reversal of 1265264243381 is 1833424625621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 820095059281 + 445169184100 = 905591^2 + 667210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265264243381 - 2¹⁸ = 1265263981237 is a prime.

It is a super-2 number, since 2×1265264243381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265264243387) 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, 632632121690 + 632632121691.

It is an arithmetic number, because the mean of its divisors is an integer number (632632121691).

Almost surely, 2^{1265264243381} is an apocalyptic number.

It is an amenable number.

1265264243381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265264243381 is an equidigital number, since it uses as much as digits as its factorization.

1265264243381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 47.

The spelling of 1265264243381 in words is "one trillion, two hundred sixty-five billion, two hundred sixty-four million, two hundred forty-three thousand, three hundred eighty-one".