66201257 has 2 divisors, whose sum is σ = 66201258. Its totient is φ = 66201256.

The previous prime is 66201253. The next prime is 66201307. The reversal of 66201257 is 75210266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48594841 + 17606416 = 6971^2 + 4196^2 .

It is a cyclic number.

It is not a de Polignac number, because 66201257 - 2² = 66201253 is a prime.

It is not a weakly prime, because it can be changed into another prime (66201253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33100628 + 33100629.

It is an arithmetic number, because the mean of its divisors is an integer number (33100629).

Almost surely, 2^66201257 is an apocalyptic number.

It is an amenable number.

66201257 is a deficient number, since it is larger than the sum of its proper divisors (1).

66201257 is an equidigital number, since it uses as much as digits as its factorization.

66201257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 66201257 is about 8136.4154884077. The cubic root of 66201257 is about 404.5343568773.

Subtracting 66201257 from its reverse (75210266), we obtain a palindrome (9009009).

The spelling of 66201257 in words is "sixty-six million, two hundred one thousand, two hundred fifty-seven".