42665957 has 2 divisors, whose sum is σ = 42665958. Its totient is φ = 42665956.

The previous prime is 42665947. The next prime is 42666053. The reversal of 42665957 is 75956624.

42665957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42003361 + 662596 = 6481^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 42665957 - 2⁴ = 42665941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42665927) 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, 21332978 + 21332979.

It is an arithmetic number, because the mean of its divisors is an integer number (21332979).

Almost surely, 2^42665957 is an apocalyptic number.

It is an amenable number.

42665957 is a deficient number, since it is larger than the sum of its proper divisors (1).

42665957 is an equidigital number, since it uses as much as digits as its factorization.

42665957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 44.

The square root of 42665957 is about 6531.9183246578. The cubic root of 42665957 is about 349.4302485371.

The spelling of 42665957 in words is "forty-two million, six hundred sixty-five thousand, nine hundred fifty-seven".