25666279 has 2 divisors, whose sum is σ = 25666280. Its totient is φ = 25666278.

The previous prime is 25666253. The next prime is 25666307. The reversal of 25666279 is 97266652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25666279 - 2²³ = 17277671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833139 + 12833140.

It is an arithmetic number, because the mean of its divisors is an integer number (12833140).

Almost surely, 2^25666279 is an apocalyptic number.

25666279 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666279 is an equidigital number, since it uses as much as digits as its factorization.

25666279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 25666279 is about 5066.1897911547. The cubic root of 25666279 is about 294.9766485394.

The spelling of 25666279 in words is "twenty-five million, six hundred sixty-six thousand, two hundred seventy-nine".