25767881 has 2 divisors, whose sum is σ = 25767882. Its totient is φ = 25767880.

The previous prime is 25767877. The next prime is 25767883. The reversal of 25767881 is 18876752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17305600 + 8462281 = 4160^2 + 2909^2 .

It is a cyclic number.

It is not a de Polignac number, because 25767881 - 2² = 25767877 is a prime.

It is a super-2 number, since 2×25767881² = 1327967382460322, which contains 22 as substring.

Together with 25767883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25767883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12883940 + 12883941.

It is an arithmetic number, because the mean of its divisors is an integer number (12883941).

Almost surely, 2^25767881 is an apocalyptic number.

It is an amenable number.

25767881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25767881 is an equidigital number, since it uses as much as digits as its factorization.

25767881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 44.

The square root of 25767881 is about 5076.2073440710. The cubic root of 25767881 is about 295.3653655494.

The spelling of 25767881 in words is "twenty-five million, seven hundred sixty-seven thousand, eight hundred eighty-one".