25864777 has 2 divisors, whose sum is σ = 25864778. Its totient is φ = 25864776.

The previous prime is 25864733. The next prime is 25864807. The reversal of 25864777 is 77746852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21492496 + 4372281 = 4636^2 + 2091^2 .

It is a cyclic number.

It is not a de Polignac number, because 25864777 - 2⁷ = 25864649 is a prime.

It is not a weakly prime, because it can be changed into another prime (25864717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12932388 + 12932389.

It is an arithmetic number, because the mean of its divisors is an integer number (12932389).

Almost surely, 2^25864777 is an apocalyptic number.

It is an amenable number.

25864777 is a deficient number, since it is larger than the sum of its proper divisors (1).

25864777 is an equidigital number, since it uses as much as digits as its factorization.

25864777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 658560, while the sum is 46.

The square root of 25864777 is about 5085.7425219922. The cubic root of 25864777 is about 295.7351272166.

The spelling of 25864777 in words is "twenty-five million, eight hundred sixty-four thousand, seven hundred seventy-seven".