42666641 has 2 divisors, whose sum is σ = 42666642. Its totient is φ = 42666640.

The previous prime is 42666629. The next prime is 42666667. The reversal of 42666641 is 14666624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31584400 + 11082241 = 5620^2 + 3329^2 .

It is a cyclic number.

It is not a de Polignac number, because 42666641 - 2⁶ = 42666577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42666601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333320 + 21333321.

It is an arithmetic number, because the mean of its divisors is an integer number (21333321).

Almost surely, 2^42666641 is an apocalyptic number.

It is an amenable number.

42666641 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666641 is an equidigital number, since it uses as much as digits as its factorization.

42666641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 35.

The square root of 42666641 is about 6531.9706827266. The cubic root of 42666641 is about 349.4321158261.

The spelling of 42666641 in words is "forty-two million, six hundred sixty-six thousand, six hundred forty-one".