25695557 has 2 divisors, whose sum is σ = 25695558. Its totient is φ = 25695556.

The previous prime is 25695547. The next prime is 25695563. The reversal of 25695557 is 75559652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22287841 + 3407716 = 4721^2 + 1846^2 .

It is a cyclic number.

It is not a de Polignac number, because 25695557 - 2¹⁸ = 25433413 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 (25695547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12847778 + 12847779.

It is an arithmetic number, because the mean of its divisors is an integer number (12847779).

Almost surely, 2^25695557 is an apocalyptic number.

It is an amenable number.

25695557 is a deficient number, since it is larger than the sum of its proper divisors (1).

25695557 is an equidigital number, since it uses as much as digits as its factorization.

25695557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472500, while the sum is 44.

The square root of 25695557 is about 5069.0785158646. The cubic root of 25695557 is about 295.0887676942.

The spelling of 25695557 in words is "twenty-five million, six hundred ninety-five thousand, five hundred fifty-seven".