42666443 has 2 divisors, whose sum is σ = 42666444. Its totient is φ = 42666442.

The previous prime is 42666433. The next prime is 42666451. The reversal of 42666443 is 34466624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42666443 - 2¹⁰ = 42665419 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42666433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333221 + 21333222.

It is an arithmetic number, because the mean of its divisors is an integer number (21333222).

Almost surely, 2^42666443 is an apocalyptic number.

42666443 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666443 is an equidigital number, since it uses as much as digits as its factorization.

42666443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 35.

The square root of 42666443 is about 6531.9555264867. The cubic root of 42666443 is about 349.4315752971.

The spelling of 42666443 in words is "forty-two million, six hundred sixty-six thousand, four hundred forty-three".