25566122611 has 2 divisors, whose sum is σ = 25566122612. Its totient is φ = 25566122610.

The previous prime is 25566122599. The next prime is 25566122641. The reversal of 25566122611 is 11622166552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25566122611 - 2¹⁹ = 25565598323 is a prime.

It is not a weakly prime, because it can be changed into another prime (25566122641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12783061305 + 12783061306.

It is an arithmetic number, because the mean of its divisors is an integer number (12783061306).

Almost surely, 2^25566122611 is an apocalyptic number.

25566122611 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566122611 is an equidigital number, since it uses as much as digits as its factorization.

25566122611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The spelling of 25566122611 in words is "twenty-five billion, five hundred sixty-six million, one hundred twenty-two thousand, six hundred eleven".