25563952811 has 2 divisors, whose sum is σ = 25563952812. Its totient is φ = 25563952810.

The previous prime is 25563952789. The next prime is 25563952837. The reversal of 25563952811 is 11825936552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25563952811 is a prime.

It is not a weakly prime, because it can be changed into another prime (25563952891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12781976405 + 12781976406.

It is an arithmetic number, because the mean of its divisors is an integer number (12781976406).

Almost surely, 2^25563952811 is an apocalyptic number.

25563952811 is a deficient number, since it is larger than the sum of its proper divisors (1).

25563952811 is an equidigital number, since it uses as much as digits as its factorization.

25563952811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 47.

The spelling of 25563952811 in words is "twenty-five billion, five hundred sixty-three million, nine hundred fifty-two thousand, eight hundred eleven".