1265440825 has 24 divisors (see below), whose sum is σ = 1732451616. Its totient is φ = 909216000.

The previous prime is 1265440823. The next prime is 1265440837. The reversal of 1265440825 is 5280445621.

It is not a de Polignac number, because 1265440825 - 2¹ = 1265440823 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265440823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4896 + ... + 50545.

It is an arithmetic number, because the mean of its divisors is an integer number (72185484).

Almost surely, 2^1265440825 is an apocalyptic number.

It is an amenable number.

1265440825 is a deficient number, since it is larger than the sum of its proper divisors (467010791).

1265440825 is a wasteful number, since it uses less digits than its factorization.

1265440825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55545 (or 55540 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The square root of 1265440825 is about 35573.0350827702. The cubic root of 1265440825 is about 1081.6347057897.

The spelling of 1265440825 in words is "one billion, two hundred sixty-five million, four hundred forty thousand, eight hundred twenty-five".