1265531371797 has 144 divisors (see below), whose sum is σ = 2193351901440. Its totient is φ = 646556359680.

The previous prime is 1265531371667. The next prime is 1265531371843. The reversal of 1265531371797 is 7971731355621.

It is not a de Polignac number, because 1265531371797 - 2³² = 1261236404501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265531371997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 531065268 + ... + 531067650.

Almost surely, 2^{1265531371797} is an apocalyptic number.

It is an amenable number.

1265531371797 is a deficient number, since it is larger than the sum of its proper divisors (927820529643).

1265531371797 is a wasteful number, since it uses less digits than its factorization.

1265531371797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904 (or 2886 counting only the distinct ones).

The product of its digits is 8334900, while the sum is 57.

The spelling of 1265531371797 in words is "one trillion, two hundred sixty-five billion, five hundred thirty-one million, three hundred seventy-one thousand, seven hundred ninety-seven".