12665001646 has 64 divisors (see below), whose sum is σ = 22457191680. Its totient is φ = 5294903040.

The previous prime is 12665001641. The next prime is 12665001653. The reversal of 12665001646 is 64610056621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12665001641) 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 31 ways as a sum of consecutive naturals, for example, 3107466 + ... + 3111538.

It is an arithmetic number, because the mean of its divisors is an integer number (350893620).

Almost surely, 2^12665001646 is an apocalyptic number.

12665001646 is a deficient number, since it is larger than the sum of its proper divisors (9792190034).

12665001646 is a wasteful number, since it uses less digits than its factorization.

12665001646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4321.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 12665001646 in words is "twelve billion, six hundred sixty-five million, one thousand, six hundred forty-six".