12721616651 has 2 divisors, whose sum is σ = 12721616652. Its totient is φ = 12721616650.

The previous prime is 12721616627. The next prime is 12721616671. The reversal of 12721616651 is 15661612721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12721616651 is a prime.

It is not a weakly prime, because it can be changed into another prime (12721616671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360808325 + 6360808326.

It is an arithmetic number, because the mean of its divisors is an integer number (6360808326).

Almost surely, 2^12721616651 is an apocalyptic number.

12721616651 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721616651 is an equidigital number, since it uses as much as digits as its factorization.

12721616651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The spelling of 12721616651 in words is "twelve billion, seven hundred twenty-one million, six hundred sixteen thousand, six hundred fifty-one".