25773661 has 2 divisors, whose sum is σ = 25773662. Its totient is φ = 25773660.

The previous prime is 25773647. The next prime is 25773677. The reversal of 25773661 is 16637752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 5433561 = 4510^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 25773661 - 2¹⁹ = 25249373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25773661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25773361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12886830 + 12886831.

It is an arithmetic number, because the mean of its divisors is an integer number (12886831).

Almost surely, 2^25773661 is an apocalyptic number.

It is an amenable number.

25773661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25773661 is an equidigital number, since it uses as much as digits as its factorization.

25773661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The square root of 25773661 is about 5076.7766348344. The cubic root of 25773661 is about 295.3874483920.

The spelling of 25773661 in words is "twenty-five million, seven hundred seventy-three thousand, six hundred sixty-one".