25013455306621 has 2 divisors, whose sum is σ = 25013455306622. Its totient is φ = 25013455306620.

The previous prime is 25013455306597. The next prime is 25013455306669. The reversal of 25013455306621 is 12660355431052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24203300499225 + 810154807396 = 4919685^2 + 900086^2 .

It is a cyclic number.

It is not a de Polignac number, because 25013455306621 - 2⁹ = 25013455306109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25013455306121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12506727653310 + 12506727653311.

It is an arithmetic number, because the mean of its divisors is an integer number (12506727653311).

Almost surely, 2^{25013455306621} is an apocalyptic number.

It is an amenable number.

25013455306621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25013455306621 is an equidigital number, since it uses as much as digits as its factorization.

25013455306621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 25013455306621 in words is "twenty-five trillion, thirteen billion, four hundred fifty-five million, three hundred six thousand, six hundred twenty-one".