1265992560 has 240 divisors, whose sum is σ = 4883973120. Its totient is φ = 287884800.

The previous prime is 1265992543. The next prime is 1265992561. The reversal of 1265992560 is 652995621.

It is a happy number.

1265992560 is a `hidden beast` number, since 1 + 2 + 6 + 599 + 2 + 56 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265992561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1204035 + ... + 1205085.

It is an arithmetic number, because the mean of its divisors is an integer number (20349888).

Almost surely, 2^1265992560 is an apocalyptic number.

1265992560 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 1265992560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2441986560).

1265992560 is an abundant number, since it is smaller than the sum of its proper divisors (3617980560).

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

1265992560 is a wasteful number, since it uses less digits than its factorization.

1265992560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1307 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 1265992560 is about 35580.7891986673. The cubic root of 1265992560 is about 1081.7918813241.

The spelling of 1265992560 in words is "one billion, two hundred sixty-five million, nine hundred ninety-two thousand, five hundred sixty".