25404661 has 2 divisors, whose sum is σ = 25404662. Its totient is φ = 25404660.

The previous prime is 25404623. The next prime is 25404671. The reversal of 25404661 is 16640452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14554225 + 10850436 = 3815^2 + 3294^2 .

It is a cyclic number.

It is not a de Polignac number, because 25404661 - 2⁹ = 25404149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25404601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702330 + 12702331.

It is an arithmetic number, because the mean of its divisors is an integer number (12702331).

Almost surely, 2^25404661 is an apocalyptic number.

It is an amenable number.

25404661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25404661 is an equidigital number, since it uses as much as digits as its factorization.

25404661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 25404661 is about 5040.3036614871. The cubic root of 25404661 is about 293.9709853052.

The spelling of 25404661 in words is "twenty-five million, four hundred four thousand, six hundred sixty-one".