1265240160 has 144 divisors (see below), whose sum is σ = 4434511536. Its totient is φ = 328264704.

The previous prime is 1265240149. The next prime is 1265240173. The reversal of 1265240160 is 610425621.

1265240160 is a `hidden beast` number, since 1 + 2 + 652 + 4 + 0 + 1 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41407 + ... + 65153.

It is an arithmetic number, because the mean of its divisors is an integer number (30795219).

Almost surely, 2^1265240160 is an apocalyptic number.

1265240160 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 1265240160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2217255768).

1265240160 is an abundant number, since it is smaller than the sum of its proper divisors (3169271376).

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

1265240160 is a wasteful number, since it uses less digits than its factorization.

1265240160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23805 (or 23794 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1265240160 is about 35570.2145059599. The cubic root of 1265240160 is about 1081.5775300089.

Adding to 1265240160 its reverse (610425621), we get a palindrome (1875665781).

The spelling of 1265240160 in words is "one billion, two hundred sixty-five million, two hundred forty thousand, one hundred sixty".