25856977541 has 2 divisors, whose sum is σ = 25856977542. Its totient is φ = 25856977540.

The previous prime is 25856977529. The next prime is 25856977607. The reversal of 25856977541 is 14577965852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23087586916 + 2769390625 = 151946^2 + 52625^2 .

It is a cyclic number.

It is not a de Polignac number, because 25856977541 - 2¹⁰ = 25856976517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25856977501) 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, 12928488770 + 12928488771.

It is an arithmetic number, because the mean of its divisors is an integer number (12928488771).

Almost surely, 2^25856977541 is an apocalyptic number.

It is an amenable number.

25856977541 is a deficient number, since it is larger than the sum of its proper divisors (1).

25856977541 is an equidigital number, since it uses as much as digits as its factorization.

25856977541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168000, while the sum is 59.

The spelling of 25856977541 in words is "twenty-five billion, eight hundred fifty-six million, nine hundred seventy-seven thousand, five hundred forty-one".