25360661 has 2 divisors, whose sum is σ = 25360662. Its totient is φ = 25360660.

The previous prime is 25360633. The next prime is 25360663. The reversal of 25360661 is 16606352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 6220036 = 4375^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 25360661 - 2²² = 21166357 is a prime.

It is a Sophie Germain prime.

Together with 25360663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25360663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12680330 + 12680331.

It is an arithmetic number, because the mean of its divisors is an integer number (12680331).

Almost surely, 2^25360661 is an apocalyptic number.

It is an amenable number.

25360661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25360661 is an equidigital number, since it uses as much as digits as its factorization.

25360661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 25360661 is about 5035.9369535370. The cubic root of 25360661 is about 293.8011713480.

The spelling of 25360661 in words is "twenty-five million, three hundred sixty thousand, six hundred sixty-one".