1265765680 has 20 divisors (see below), whose sum is σ = 2942905392. Its totient is φ = 506306240.

The previous prime is 1265765659. The next prime is 1265765689. The reversal of 1265765680 is 865675621.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1265765680.

It is not an unprimeable number, because it can be changed into a prime (1265765689) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7910956 + ... + 7911115.

Almost surely, 2^1265765680 is an apocalyptic number.

1265765680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265765680 is an abundant number, since it is smaller than the sum of its proper divisors (1677139712).

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

1265765680 is a wasteful number, since it uses less digits than its factorization.

1265765680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15822084 (or 15822078 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 1265765680 is about 35577.6008184925. The cubic root of 1265765680 is about 1081.7272544026.

The spelling of 1265765680 in words is "one billion, two hundred sixty-five million, seven hundred sixty-five thousand, six hundred eighty".