1265805525 has 12 divisors (see below), whose sum is σ = 2092798592. Its totient is φ = 675096240.

The previous prime is 1265805523. The next prime is 1265805559. The reversal of 1265805525 is 5255085621.

It is not a de Polignac number, because 1265805525 - 2¹ = 1265805523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265805523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8438629 + ... + 8438778.

Almost surely, 2^1265805525 is an apocalyptic number.

1265805525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265805525 is a deficient number, since it is larger than the sum of its proper divisors (826993067).

1265805525 is a wasteful number, since it uses less digits than its factorization.

1265805525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16877420 (or 16877415 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 39.

The square root of 1265805525 is about 35578.1607872020. The cubic root of 1265805525 is about 1081.7386048368.

The spelling of 1265805525 in words is "one billion, two hundred sixty-five million, eight hundred five thousand, five hundred twenty-five".