42166685 has 12 divisors (see below), whose sum is σ = 55619004. Its totient is φ = 30666240.

The previous prime is 42166679. The next prime is 42166697. The reversal of 42166685 is 58666124.

42166685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33605209 + 8561476 = 5797^2 + 2926^2 .

It is not a de Polignac number, because 42166685 - 2⁴ = 42166669 is a prime.

It is a Duffinian number.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 34244 + ... + 35453.

It is an arithmetic number, because the mean of its divisors is an integer number (4634917).

Almost surely, 2^42166685 is an apocalyptic number.

It is an amenable number.

42166685 is a deficient number, since it is larger than the sum of its proper divisors (13452319).

42166685 is a wasteful number, since it uses less digits than its factorization.

42166685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69724 (or 69713 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 42166685 is about 6493.5879912418. The cubic root of 42166685 is about 348.0618999636.

It can be divided in two parts, 4216 and 6685, that added together give a palindrome (10901).

The spelling of 42166685 in words is "forty-two million, one hundred sixty-six thousand, six hundred eighty-five".