25666111189 has 2 divisors, whose sum is σ = 25666111190. Its totient is φ = 25666111188.

The previous prime is 25666111129. The next prime is 25666111241. The reversal of 25666111189 is 98111166652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13419368964 + 12246742225 = 115842^2 + 110665^2 .

It is a cyclic number.

It is not a de Polignac number, because 25666111189 - 2¹⁹ = 25665586901 is a prime.

It is a super-2 number, since 2×25666111189² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666111109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833055594 + 12833055595.

It is an arithmetic number, because the mean of its divisors is an integer number (12833055595).

Almost surely, 2^25666111189 is an apocalyptic number.

It is an amenable number.

25666111189 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666111189 is an equidigital number, since it uses as much as digits as its factorization.

25666111189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 46.

The spelling of 25666111189 in words is "twenty-five billion, six hundred sixty-six million, one hundred eleven thousand, one hundred eighty-nine".