25205211611 has 2 divisors, whose sum is σ = 25205211612. Its totient is φ = 25205211610.

The previous prime is 25205211607. The next prime is 25205211673. The reversal of 25205211611 is 11611250252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25205211611 - 2² = 25205211607 is a prime.

It is not a weakly prime, because it can be changed into another prime (25205211601) 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, 12602605805 + 12602605806.

It is an arithmetic number, because the mean of its divisors is an integer number (12602605806).

Almost surely, 2^25205211611 is an apocalyptic number.

25205211611 is a deficient number, since it is larger than the sum of its proper divisors (1).

25205211611 is an equidigital number, since it uses as much as digits as its factorization.

25205211611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 25205211611 its reverse (11611250252), we get a palindrome (36816461863).

The spelling of 25205211611 in words is "twenty-five billion, two hundred five million, two hundred eleven thousand, six hundred eleven".