12876820665 has 8 divisors (see below), whose sum is σ = 20602913088. Its totient is φ = 6867637680.

The previous prime is 12876820633. The next prime is 12876820673. The reversal of 12876820665 is 56602867821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12876820665 - 2⁵ = 12876820633 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 7 ways as a sum of consecutive naturals, for example, 429227341 + ... + 429227370.

It is an arithmetic number, because the mean of its divisors is an integer number (2575364136).

Almost surely, 2^12876820665 is an apocalyptic number.

12876820665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12876820665 is a deficient number, since it is larger than the sum of its proper divisors (7726092423).

12876820665 is an equidigital number, since it uses as much as digits as its factorization.

12876820665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858454719.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 12876820665 in words is "twelve billion, eight hundred seventy-six million, eight hundred twenty thousand, six hundred sixty-five".