25666111 has 2 divisors, whose sum is σ = 25666112. Its totient is φ = 25666110.

The previous prime is 25666099. The next prime is 25666117. The reversal of 25666111 is 11166652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25666111 - 2²³ = 17277503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25666111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833055 + 12833056.

It is an arithmetic number, because the mean of its divisors is an integer number (12833056).

Almost surely, 2^25666111 is an apocalyptic number.

25666111 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666111 is an equidigital number, since it uses as much as digits as its factorization.

25666111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 25666111 is about 5066.1732106196. The cubic root of 25666111 is about 294.9760049429.

The spelling of 25666111 in words is "twenty-five million, six hundred sixty-six thousand, one hundred eleven".