1265532560 has 20 divisors (see below), whose sum is σ = 2942363388. Its totient is φ = 506212992.

The previous prime is 1265532559. The next prime is 1265532577. The reversal of 1265532560 is 652355621.

It can be written as a sum of positive squares in 2 ways, for example, as 342102016 + 923430544 = 18496^2 + 30388^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1265532560.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7909499 + ... + 7909658.

Almost surely, 2^1265532560 is an apocalyptic number.

1265532560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265532560 is an abundant number, since it is smaller than the sum of its proper divisors (1676830828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265532560 is a wasteful number, since it uses less digits than its factorization.

1265532560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15819170 (or 15819164 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 1265532560 is about 35574.3244489618. The cubic root of 1265532560 is about 1081.6608419683.

The spelling of 1265532560 in words is "one billion, two hundred sixty-five million, five hundred thirty-two thousand, five hundred sixty".