25324425661 has 2 divisors, whose sum is σ = 25324425662. Its totient is φ = 25324425660.

The previous prime is 25324425613. The next prime is 25324425689. The reversal of 25324425661 is 16652442352.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16076718436 + 9247707225 = 126794^2 + 96165^2 .

It is a cyclic number.

It is not a de Polignac number, because 25324425661 - 2¹¹ = 25324423613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25324425601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12662212830 + 12662212831.

It is an arithmetic number, because the mean of its divisors is an integer number (12662212831).

Almost surely, 2^25324425661 is an apocalyptic number.

It is an amenable number.

25324425661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25324425661 is an equidigital number, since it uses as much as digits as its factorization.

25324425661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 40.

The spelling of 25324425661 in words is "twenty-five billion, three hundred twenty-four million, four hundred twenty-five thousand, six hundred sixty-one".