12641216061 has 4 divisors (see below), whose sum is σ = 16854954752. Its totient is φ = 8427477372.

The previous prime is 12641216051. The next prime is 12641216069. The reversal of 12641216061 is 16061214621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16061214621 = 3 ⋅5353738207.

It is not a de Polignac number, because 12641216061 - 2⁹ = 12641215549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641216069) 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, 2106869341 + ... + 2106869346.

It is an arithmetic number, because the mean of its divisors is an integer number (4213738688).

Almost surely, 2^12641216061 is an apocalyptic number.

It is an amenable number.

12641216061 is a deficient number, since it is larger than the sum of its proper divisors (4213738691).

12641216061 is an equidigital number, since it uses as much as digits as its factorization.

12641216061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213738690.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 12641216061 in words is "twelve billion, six hundred forty-one million, two hundred sixteen thousand, sixty-one".