12665476680 has 128 divisors (see below), whose sum is σ = 40355210880. Its totient is φ = 3169013760.

The previous prime is 12665476673. The next prime is 12665476699. The reversal of 12665476680 is 8667456621.

It is a Cunningham number, because it is equal to 112541²-1.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665862 + ... + 684618.

It is an arithmetic number, because the mean of its divisors is an integer number (315275085).

Almost surely, 2^12665476680 is an apocalyptic number.

12665476680 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 12665476680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20177605440).

12665476680 is an abundant number, since it is smaller than the sum of its proper divisors (27689734200).

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

12665476680 is a wasteful number, since it uses less digits than its factorization.

12665476680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19119 (or 19115 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 12665476680 in words is "twelve billion, six hundred sixty-five million, four hundred seventy-six thousand, six hundred eighty".