66871705 has 16 divisors (see below), whose sum is σ = 82145664. Its totient is φ = 52245760.

The previous prime is 66871687. The next prime is 66871711. The reversal of 66871705 is 50717866.

It is not a de Polignac number, because 66871705 - 2⁹ = 66871193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39282 + ... + 40948.

It is an arithmetic number, because the mean of its divisors is an integer number (5134104).

Almost surely, 2^66871705 is an apocalyptic number.

It is an amenable number.

66871705 is a deficient number, since it is larger than the sum of its proper divisors (15273959).

66871705 is a wasteful number, since it uses less digits than its factorization.

66871705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 66871705 is about 8177.5121522380. The cubic root of 66871705 is about 405.8954024514.

It can be divided in two parts, 66871 and 705, that added together give a palindrome (67576).

The spelling of 66871705 in words is "sixty-six million, eight hundred seventy-one thousand, seven hundred five".