25981777 has 2 divisors, whose sum is σ = 25981778. Its totient is φ = 25981776.

The previous prime is 25981691. The next prime is 25981783. The reversal of 25981777 is 77718952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 12173121 = 3716^2 + 3489^2 .

It is a cyclic number.

It is not a de Polignac number, because 25981777 - 2¹¹ = 25979729 is a prime.

It is not a weakly prime, because it can be changed into another prime (25981877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12990888 + 12990889.

It is an arithmetic number, because the mean of its divisors is an integer number (12990889).

Almost surely, 2^25981777 is an apocalyptic number.

It is an amenable number.

25981777 is a deficient number, since it is larger than the sum of its proper divisors (1).

25981777 is an equidigital number, since it uses as much as digits as its factorization.

25981777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The square root of 25981777 is about 5097.2322882129. The cubic root of 25981777 is about 296.1803784006.

The spelling of 25981777 in words is "twenty-five million, nine hundred eighty-one thousand, seven hundred seventy-seven".