1265125560 has 64 divisors (see below), whose sum is σ = 3809479680. Its totient is φ = 336113280.

The previous prime is 1265125559. The next prime is 1265125573. The reversal of 1265125560 is 655215621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13069 + ... + 51971.

It is an arithmetic number, because the mean of its divisors is an integer number (59523120).

Almost surely, 2^1265125560 is an apocalyptic number.

1265125560 is a gapful number since it is divisible by the number (10) 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 1265125560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1904739840).

1265125560 is an abundant number, since it is smaller than the sum of its proper divisors (2544354120).

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

1265125560 is a wasteful number, since it uses less digits than its factorization.

1265125560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39188 (or 39184 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 1265125560 is about 35568.6035711272. The cubic root of 1265125560 is about 1081.5448741461.

The spelling of 1265125560 in words is "one billion, two hundred sixty-five million, one hundred twenty-five thousand, five hundred sixty".