25666477 has 2 divisors, whose sum is σ = 25666478. Its totient is φ = 25666476.

The previous prime is 25666439. The next prime is 25666577. The reversal of 25666477 is 77466652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 9554281 = 4014^2 + 3091^2 .

It is a cyclic number.

It is not a de Polignac number, because 25666477 - 2⁷ = 25666349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833238 + 12833239.

It is an arithmetic number, because the mean of its divisors is an integer number (12833239).

Almost surely, 2^25666477 is an apocalyptic number.

It is an amenable number.

25666477 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666477 is an equidigital number, since it uses as much as digits as its factorization.

25666477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 43.

The square root of 25666477 is about 5066.2093324299. The cubic root of 25666477 is about 294.9774070603.

The spelling of 25666477 in words is "twenty-five million, six hundred sixty-six thousand, four hundred seventy-seven".