42662666 has 4 divisors (see below), whose sum is σ = 63994002. Its totient is φ = 21331332.

The previous prime is 42662651. The next prime is 42662671. The reversal of 42662666 is 66626624.

42662666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41152225 + 1510441 = 6415^2 + 1229^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665665 + ... + 10665668.

Almost surely, 2^42662666 is an apocalyptic number.

42662666 is a deficient number, since it is larger than the sum of its proper divisors (21331336).

42662666 is a wasteful number, since it uses less digits than its factorization.

42662666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21331335.

The product of its digits is 124416, while the sum is 38.

The square root of 42662666 is about 6531.6664029940. Note that the first 3 decimals coincide. The cubic root of 42662666 is about 349.4212639774.

The spelling of 42662666 in words is "forty-two million, six hundred sixty-two thousand, six hundred sixty-six".