12665611392 has 128 divisors (see below), whose sum is σ = 39023600640. Its totient is φ = 3564684288.

The previous prime is 12665611381. The next prime is 12665611487. The reversal of 12665611392 is 29311656621.

12665611392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

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 15 ways as a sum of consecutive naturals, for example, 144933 + ... + 215259.

It is an arithmetic number, because the mean of its divisors is an integer number (304871880).

Almost surely, 2^12665611392 is an apocalyptic number.

12665611392 is a gapful number since it is divisible by the number (12) 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 12665611392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19511800320).

12665611392 is an abundant number, since it is smaller than the sum of its proper divisors (26357989248).

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

12665611392 is an equidigital number, since it uses as much as digits as its factorization.

12665611392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70418 (or 70406 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The spelling of 12665611392 in words is "twelve billion, six hundred sixty-five million, six hundred eleven thousand, three hundred ninety-two".