25170661 has 2 divisors, whose sum is σ = 25170662. Its totient is φ = 25170660.

The previous prime is 25170647. The next prime is 25170683. The reversal of 25170661 is 16607152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 7480225 = 4206^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 25170661 - 2¹¹ = 25168613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25170641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585330 + 12585331.

It is an arithmetic number, because the mean of its divisors is an integer number (12585331).

Almost surely, 2^25170661 is an apocalyptic number.

It is an amenable number.

25170661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25170661 is an equidigital number, since it uses as much as digits as its factorization.

25170661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 25170661 is about 5017.0370738116. The cubic root of 25170661 is about 293.0656199248.

The spelling of 25170661 in words is "twenty-five million, one hundred seventy thousand, six hundred sixty-one".