42666523 has 2 divisors, whose sum is σ = 42666524. Its totient is φ = 42666522.

The previous prime is 42666497. The next prime is 42666577. The reversal of 42666523 is 32566624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42666523 - 2²⁵ = 9112091 is a prime.

It is not a weakly prime, because it can be changed into another prime (42666223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333261 + 21333262.

It is an arithmetic number, because the mean of its divisors is an integer number (21333262).

Almost surely, 2^42666523 is an apocalyptic number.

42666523 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666523 is an equidigital number, since it uses as much as digits as its factorization.

42666523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 34.

The square root of 42666523 is about 6531.9616502242. The cubic root of 42666523 is about 349.4317936928.

The spelling of 42666523 in words is "forty-two million, six hundred sixty-six thousand, five hundred twenty-three".