25666237 has 2 divisors, whose sum is σ = 25666238. Its totient is φ = 25666236.

The previous prime is 25666217. The next prime is 25666241. The reversal of 25666237 is 73266652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23609881 + 2056356 = 4859^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 25666237 - 2¹¹ = 25664189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25666196 and 25666205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833118 + 12833119.

It is an arithmetic number, because the mean of its divisors is an integer number (12833119).

Almost surely, 2^25666237 is an apocalyptic number.

It is an amenable number.

25666237 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666237 is an equidigital number, since it uses as much as digits as its factorization.

25666237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 37.

The square root of 25666237 is about 5066.1856460260. The cubic root of 25666237 is about 294.9764876406.

The spelling of 25666237 in words is "twenty-five million, six hundred sixty-six thousand, two hundred thirty-seven".