25777681 has 2 divisors, whose sum is σ = 25777682. Its totient is φ = 25777680.

The previous prime is 25777651. The next prime is 25777711. The reversal of 25777681 is 18677752.

It is a balanced prime because it is at equal distance from previous prime (25777651) and next prime (25777711).

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 11451456 = 3785^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 25777681 - 2⁷ = 25777553 is a prime.

It is a super-2 number, since 2×25777681² = 1328977675475522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25777651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12888840 + 12888841.

It is an arithmetic number, because the mean of its divisors is an integer number (12888841).

Almost surely, 2^25777681 is an apocalyptic number.

It is an amenable number.

25777681 is a deficient number, since it is larger than the sum of its proper divisors (1).

25777681 is an equidigital number, since it uses as much as digits as its factorization.

25777681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164640, while the sum is 43.

The square root of 25777681 is about 5077.1725399084. The cubic root of 25777681 is about 295.4028051007.

The spelling of 25777681 in words is "twenty-five million, seven hundred seventy-seven thousand, six hundred eighty-one".