12660651361 has 4 divisors (see below), whose sum is σ = 12661069824. Its totient is φ = 12660232900.

The previous prime is 12660651359. The next prime is 12660651371. The reversal of 12660651361 is 16315606621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12660651361 - 2¹ = 12660651359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12660651361.

It is not an unprimeable number, because it can be changed into a prime (12660651371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159985 + ... + 225646.

It is an arithmetic number, because the mean of its divisors is an integer number (3165267456).

Almost surely, 2^12660651361 is an apocalyptic number.

It is an amenable number.

12660651361 is a deficient number, since it is larger than the sum of its proper divisors (418463).

12660651361 is an equidigital number, since it uses as much as digits as its factorization.

12660651361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418462.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 12660651361 in words is "twelve billion, six hundred sixty million, six hundred fifty-one thousand, three hundred sixty-one".