12665636403 has 8 divisors (see below), whose sum is σ = 19300017408. Its totient is φ = 7237506504.

The previous prime is 12665636353. The next prime is 12665636449. The reversal of 12665636403 is 30463656621.

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 12665636403 - 2⁸ = 12665636147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12665636003) by changing a digit.

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, 301562751 + ... + 301562792.

It is an arithmetic number, because the mean of its divisors is an integer number (2412502176).

Almost surely, 2^12665636403 is an apocalyptic number.

12665636403 is a deficient number, since it is larger than the sum of its proper divisors (6634381005).

12665636403 is an equidigital number, since it uses as much as digits as its factorization.

12665636403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603125553.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 12665636403 in words is "twelve billion, six hundred sixty-five million, six hundred thirty-six thousand, four hundred three".