12725452721 has 2 divisors, whose sum is σ = 12725452722. Its totient is φ = 12725452720.

The previous prime is 12725452687. The next prime is 12725452763.

12725452721 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10974867121 + 1750585600 = 104761^2 + 41840^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12725452721 - 2⁶ = 12725452657 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (12725452781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6362726360 + 6362726361.

It is an arithmetic number, because the mean of its divisors is an integer number (6362726361).

Almost surely, 2^12725452721 is an apocalyptic number.

It is an amenable number.

12725452721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12725452721 is an equidigital number, since it uses as much as digits as its factorization.

12725452721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 38.

The spelling of 12725452721 in words is "twelve billion, seven hundred twenty-five million, four hundred fifty-two thousand, seven hundred twenty-one".