42666623 has 2 divisors, whose sum is σ = 42666624. Its totient is φ = 42666622.

The previous prime is 42666601. The next prime is 42666629. The reversal of 42666623 is 32666624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42666623 - 2¹² = 42662527 is a prime.

It is equal to p_2585663 and since 42666623 and 2585663 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42666629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333311 + 21333312.

It is an arithmetic number, because the mean of its divisors is an integer number (21333312).

Almost surely, 2^42666623 is an apocalyptic number.

42666623 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666623 is an equidigital number, since it uses as much as digits as its factorization.

42666623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 35.

The square root of 42666623 is about 6531.9693048881. The cubic root of 42666623 is about 349.4320666871.

Subtracting from 42666623 its reverse (32666624), we obtain a palindrome (9999999).

The spelling of 42666623 in words is "forty-two million, six hundred sixty-six thousand, six hundred twenty-three".