42666257 has 2 divisors, whose sum is σ = 42666258. Its totient is φ = 42666256.

The previous prime is 42666223. The next prime is 42666269. The reversal of 42666257 is 75266624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42627841 + 38416 = 6529^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 42666257 - 2⁶ = 42666193 is a prime.

It is a Chen prime.

It is equal to p_2585639 and since 42666257 and 2585639 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42666257.

It is not a weakly prime, because it can be changed into another prime (42666287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333128 + 21333129.

It is an arithmetic number, because the mean of its divisors is an integer number (21333129).

Almost surely, 2^42666257 is an apocalyptic number.

It is an amenable number.

42666257 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666257 is an equidigital number, since it uses as much as digits as its factorization.

42666257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 38.

The square root of 42666257 is about 6531.9412887747. The cubic root of 42666257 is about 349.4310675259.

The spelling of 42666257 in words is "forty-two million, six hundred sixty-six thousand, two hundred fifty-seven".