25776761 has 2 divisors, whose sum is σ = 25776762. Its totient is φ = 25776760.

The previous prime is 25776733. The next prime is 25776781. The reversal of 25776761 is 16767752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 7458361 = 4280^2 + 2731^2 .

It is a cyclic number.

It is not a de Polignac number, because 25776761 - 2⁶ = 25776697 is a prime.

It is a super-2 number, since 2×25776761² = 1328882815302242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25776701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12888380 + 12888381.

It is an arithmetic number, because the mean of its divisors is an integer number (12888381).

Almost surely, 2^25776761 is an apocalyptic number.

It is an amenable number.

25776761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25776761 is an equidigital number, since it uses as much as digits as its factorization.

25776761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 41.

The square root of 25776761 is about 5077.0819374913. The cubic root of 25776761 is about 295.3992907710.

Subtracting from 25776761 its reverse (16767752), we obtain a palindrome (9009009).

The spelling of 25776761 in words is "twenty-five million, seven hundred seventy-six thousand, seven hundred sixty-one".