65657257 has 2 divisors, whose sum is σ = 65657258. Its totient is φ = 65657256.

The previous prime is 65657237. The next prime is 65657299. The reversal of 65657257 is 75275656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57699216 + 7958041 = 7596^2 + 2821^2 .

It is a cyclic number.

It is not a de Polignac number, because 65657257 - 2¹¹ = 65655209 is a prime.

It is not a weakly prime, because it can be changed into another prime (65657237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32828628 + 32828629.

It is an arithmetic number, because the mean of its divisors is an integer number (32828629).

Almost surely, 2^65657257 is an apocalyptic number.

It is an amenable number.

65657257 is a deficient number, since it is larger than the sum of its proper divisors (1).

65657257 is an equidigital number, since it uses as much as digits as its factorization.

65657257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 441000, while the sum is 43.

The square root of 65657257 is about 8102.9165736789. The cubic root of 65657257 is about 403.4232387670.

The spelling of 65657257 in words is "sixty-five million, six hundred fifty-seven thousand, two hundred fifty-seven".