1265264243379 has 12 divisors (see below), whose sum is σ = 1828442670600. Its totient is φ = 843122373984.

The previous prime is 1265264243371. The next prime is 1265264243381. The reversal of 1265264243379 is 9733424625621.

1265264243379 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 26 + 4 + 243 + 379 = 666.

It is not a de Polignac number, because 1265264243379 - 2³ = 1265264243371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1265264243371) 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 in 11 ways as a sum of consecutive naturals, for example, 32239434 + ... + 32278655.

It is an arithmetic number, because the mean of its divisors is an integer number (152370222550).

Almost surely, 2^{1265264243379} is an apocalyptic number.

1265264243379 is a deficient number, since it is larger than the sum of its proper divisors (563178427221).

1265264243379 is a wasteful number, since it uses less digits than its factorization.

1265264243379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64520274 (or 64520271 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 1265264243379 in words is "one trillion, two hundred sixty-five billion, two hundred sixty-four million, two hundred forty-three thousand, three hundred seventy-nine".