1265040660 has 96 divisors (see below), whose sum is σ = 3857656320. Its totient is φ = 307878912.

The previous prime is 1265040659. The next prime is 1265040671. The reversal of 1265040660 is 660405621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60309 + ... + 78531.

It is an arithmetic number, because the mean of its divisors is an integer number (40183920).

Almost surely, 2^1265040660 is an apocalyptic number.

1265040660 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 1265040660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1928828160).

1265040660 is an abundant number, since it is smaller than the sum of its proper divisors (2592615660).

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

1265040660 is a wasteful number, since it uses less digits than its factorization.

1265040660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18337 (or 18335 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1265040660 is about 35567.4100828272. The cubic root of 1265040660 is about 1081.5206801802.

The spelling of 1265040660 in words is "one billion, two hundred sixty-five million, forty thousand, six hundred sixty".