25666349 has 2 divisors, whose sum is σ = 25666350. Its totient is φ = 25666348.

The previous prime is 25666337. The next prime is 25666351. The reversal of 25666349 is 94366652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14822500 + 10843849 = 3850^2 + 3293^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25666349 is a prime.

It is a super-2 number, since 2×25666349² = 1317522941979602, which contains 22 as substring.

Together with 25666351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25663349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833174 + 12833175.

It is an arithmetic number, because the mean of its divisors is an integer number (12833175).

Almost surely, 2^25666349 is an apocalyptic number.

It is an amenable number.

25666349 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666349 is an equidigital number, since it uses as much as digits as its factorization.

25666349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 41.

The square root of 25666349 is about 5066.1966996949. The cubic root of 25666349 is about 294.9769167038.

The spelling of 25666349 in words is "twenty-five million, six hundred sixty-six thousand, three hundred forty-nine".