42535666 has 16 divisors (see below), whose sum is σ = 68667480. Its totient is φ = 19687680.

The previous prime is 42535657. The next prime is 42535673. The reversal of 42535666 is 66653524.

It can be written as a sum of positive squares in 4 ways, for example, as 24651225 + 17884441 = 4965^2 + 4229^2 .

It is an unprimeable number.

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, 8181 + ... + 12328.

Almost surely, 2^42535666 is an apocalyptic number.

42535666 is a deficient number, since it is larger than the sum of its proper divisors (26131814).

42535666 is a wasteful number, since it uses less digits than its factorization.

42535666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20589.

The product of its digits is 129600, while the sum is 37.

The square root of 42535666 is about 6521.9372888736. The cubic root of 42535666 is about 349.0741954387.

The spelling of 42535666 in words is "forty-two million, five hundred thirty-five thousand, six hundred sixty-six".