12665263500 has 144 divisors (see below), whose sum is σ = 42305215680. Its totient is φ = 3178713600.

The previous prime is 12665263487. The next prime is 12665263537. The reversal of 12665263500 is 536256621.

It is a happy number.

12665263500 is a `hidden beast` number, since 12 + 6 + 6 + 5 + 2 + 635 + 0 + 0 = 666.

12665263500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 47 ways as a sum of consecutive naturals, for example, 6280 + ... + 159279.

It is an arithmetic number, because the mean of its divisors is an integer number (293786220).

Almost surely, 2^12665263500 is an apocalyptic number.

12665263500 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 12665263500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21152607840).

12665263500 is an abundant number, since it is smaller than the sum of its proper divisors (29639952180).

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

12665263500 is a wasteful number, since it uses less digits than its factorization.

12665263500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165601 (or 165586 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 12665263500 in words is "twelve billion, six hundred sixty-five million, two hundred sixty-three thousand, five hundred".