25756543 has 2 divisors, whose sum is σ = 25756544. Its totient is φ = 25756542.

The previous prime is 25756529. The next prime is 25756583. The reversal of 25756543 is 34565752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25756543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25756583) 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, 12878271 + 12878272.

It is an arithmetic number, because the mean of its divisors is an integer number (12878272).

Almost surely, 2^25756543 is an apocalyptic number.

25756543 is a deficient number, since it is larger than the sum of its proper divisors (1).

25756543 is an equidigital number, since it uses as much as digits as its factorization.

25756543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126000, while the sum is 37.

The square root of 25756543 is about 5075.0904425439. The cubic root of 25756543 is about 295.3220384348.

The spelling of 25756543 in words is "twenty-five million, seven hundred fifty-six thousand, five hundred forty-three".