25765777 has 2 divisors, whose sum is σ = 25765778. Its totient is φ = 25765776.

The previous prime is 25765763. The next prime is 25765781. The reversal of 25765777 is 77756752.

It is a Cunningham number, because it is equal to 5076²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25765776 + 1 = 5076^2 + 1^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25765777 is a prime.

It is not a weakly prime, because it can be changed into another prime (25765757) 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, 12882888 + 12882889.

It is an arithmetic number, because the mean of its divisors is an integer number (12882889).

Almost surely, 2^25765777 is an apocalyptic number.

It is an amenable number.

25765777 is a deficient number, since it is larger than the sum of its proper divisors (1).

25765777 is an equidigital number, since it uses as much as digits as its factorization.

25765777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720300, while the sum is 46.

The square root of 25765777 is about 5076.0000985028. Note that the first 4 decimals coincide. The cubic root of 25765777 is about 295.3573262693.

The spelling of 25765777 in words is "twenty-five million, seven hundred sixty-five thousand, seven hundred seventy-seven".