1265291291625 has 32 divisors (see below), whose sum is σ = 2154408567168. Its totient is φ = 659128478400.

The previous prime is 1265291291611. The next prime is 1265291291681. The reversal of 1265291291625 is 5261921925621.

It is not a de Polignac number, because 1265291291625 - 2¹³ = 1265291283433 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39217714 + ... + 39249963.

It is an arithmetic number, because the mean of its divisors is an integer number (67325267724).

Almost surely, 2^{1265291291625} is an apocalyptic number.

1265291291625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265291291625 is a deficient number, since it is larger than the sum of its proper divisors (889117275543).

1265291291625 is an equidigital number, since it uses as much as digits as its factorization.

1265291291625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78467738 (or 78467728 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 51.

The spelling of 1265291291625 in words is "one trillion, two hundred sixty-five billion, two hundred ninety-one million, two hundred ninety-one thousand, six hundred twenty-five".