12665036523 has 16 divisors (see below), whose sum is σ = 17138268576. Its totient is φ = 8317854720.

The previous prime is 12665036521. The next prime is 12665036537. The reversal of 12665036523 is 32563056621.

It is not a de Polignac number, because 12665036523 - 2¹ = 12665036521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12665036521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153943 + ... + 221423.

It is an arithmetic number, because the mean of its divisors is an integer number (1071141786).

Almost surely, 2^12665036523 is an apocalyptic number.

12665036523 is a deficient number, since it is larger than the sum of its proper divisors (4473232053).

12665036523 is an equidigital number, since it uses as much as digits as its factorization.

12665036523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68414.

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 12665036523 in words is "twelve billion, six hundred sixty-five million, thirty-six thousand, five hundred twenty-three".