42666645 has 16 divisors (see below), whose sum is σ = 78019200. Its totient is φ = 19504704.

The previous prime is 42666641. The next prime is 42666667. The reversal of 42666645 is 54666624.

It is not a de Polignac number, because 42666645 - 2² = 42666641 is a prime.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 203070 + ... + 203279.

It is an arithmetic number, because the mean of its divisors is an integer number (4876200).

Almost surely, 2^42666645 is an apocalyptic number.

It is an amenable number.

42666645 is a deficient number, since it is larger than the sum of its proper divisors (35352555).

42666645 is a wasteful number, since it uses less digits than its factorization.

42666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406364.

The product of its digits is 207360, while the sum is 39.

The square root of 42666645 is about 6531.9709889129. The cubic root of 42666645 is about 349.4321267458.

The spelling of 42666645 in words is "forty-two million, six hundred sixty-six thousand, six hundred forty-five".