42666646 has 16 divisors (see below), whose sum is σ = 70030800. Its totient is φ = 19334880.

The previous prime is 42666641. The next prime is 42666667. The reversal of 42666646 is 64666624.

It is a junction number, because it is equal to n+sod(n) for n = 42666599 and 42666608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42666641) 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 7 ways as a sum of consecutive naturals, for example, 4900 + ... + 10456.

It is an arithmetic number, because the mean of its divisors is an integer number (4376925).

Almost surely, 2^42666646 is an apocalyptic number.

42666646 is a deficient number, since it is larger than the sum of its proper divisors (27364154).

42666646 is a wasteful number, since it uses less digits than its factorization.

42666646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919.

The product of its digits is 248832, while the sum is 40.

The square root of 42666646 is about 6531.9710654595. The cubic root of 42666646 is about 349.4321294758.

The spelling of 42666646 in words is "forty-two million, six hundred sixty-six thousand, six hundred forty-six".