25072661 has 2 divisors, whose sum is σ = 25072662. Its totient is φ = 25072660.

The previous prime is 25072639. The next prime is 25072669. The reversal of 25072661 is 16627052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 12292036 = 3575^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 25072661 - 2¹⁸ = 24810517 is a prime.

It is equal to p_1570196 and since 25072661 and 1570196 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25072669) 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, 12536330 + 12536331.

It is an arithmetic number, because the mean of its divisors is an integer number (12536331).

Almost surely, 2^25072661 is an apocalyptic number.

It is an amenable number.

25072661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25072661 is an equidigital number, since it uses as much as digits as its factorization.

25072661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 25072661 is about 5007.2608280376. The cubic root of 25072661 is about 292.6847825527.

The spelling of 25072661 in words is "twenty-five million, seventy-two thousand, six hundred sixty-one".