1265263512 has 64 divisors (see below), whose sum is σ = 3272217600. Its totient is φ = 407272320.

The previous prime is 1265263501. The next prime is 1265263513. The reversal of 1265263512 is 2153625621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265263513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405414 + ... + 408522.

It is an arithmetic number, because the mean of its divisors is an integer number (51128400).

Almost surely, 2^1265263512 is an apocalyptic number.

1265263512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265263512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1636108800).

1265263512 is an abundant number, since it is smaller than the sum of its proper divisors (2006954088).

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

1265263512 is a wasteful number, since it uses less digits than its factorization.

1265263512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3692 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 1265263512 is about 35570.5427566125. The cubic root of 1265263512 is about 1081.5841840403.

The spelling of 1265263512 in words is "one billion, two hundred sixty-five million, two hundred sixty-three thousand, five hundred twelve".