25511250409 has 2 divisors, whose sum is σ = 25511250410. Its totient is φ = 25511250408.

The previous prime is 25511250389. The next prime is 25511250419. The reversal of 25511250409 is 90405211552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23053867225 + 2457383184 = 151835^2 + 49572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25511250409 is a prime.

It is not a weakly prime, because it can be changed into another prime (25511250419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755625204 + 12755625205.

It is an arithmetic number, because the mean of its divisors is an integer number (12755625205).

Almost surely, 2^25511250409 is an apocalyptic number.

It is an amenable number.

25511250409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25511250409 is an equidigital number, since it uses as much as digits as its factorization.

25511250409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 34.

The spelling of 25511250409 in words is "twenty-five billion, five hundred eleven million, two hundred fifty thousand, four hundred nine".