42666549 has 16 divisors (see below), whose sum is σ = 60367680. Its totient is φ = 26712320.

The previous prime is 42666523. The next prime is 42666577. The reversal of 42666549 is 94566624.

It is a cyclic number.

It is not a de Polignac number, because 42666549 - 2⁸ = 42666293 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42666549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42666149) 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 in 15 ways as a sum of consecutive naturals, for example, 41362 + ... + 42380.

It is an arithmetic number, because the mean of its divisors is an integer number (3772980).

Almost surely, 2^42666549 is an apocalyptic number.

It is an amenable number.

42666549 is a deficient number, since it is larger than the sum of its proper divisors (17701131).

42666549 is a wasteful number, since it uses less digits than its factorization.

42666549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860.

The product of its digits is 311040, while the sum is 42.

The square root of 42666549 is about 6531.9636404377. The cubic root of 42666549 is about 349.4318646714.

The spelling of 42666549 in words is "forty-two million, six hundred sixty-six thousand, five hundred forty-nine".