66871586 has 4 divisors (see below), whose sum is σ = 100307382. Its totient is φ = 33435792.

The previous prime is 66871573. The next prime is 66871589. The reversal of 66871586 is 68517866.

66871586 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., 56535361 + 10336225 = 7519^2 + 3215^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66871586.

It is not an unprimeable number, because it can be changed into a prime (66871589) by changing a digit.

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, 16717895 + ... + 16717898.

Almost surely, 2^66871586 is an apocalyptic number.

66871586 is a deficient number, since it is larger than the sum of its proper divisors (33435796).

66871586 is a wasteful number, since it uses less digits than its factorization.

66871586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33435795.

The product of its digits is 483840, while the sum is 47.

The square root of 66871586 is about 8177.5048761832. The cubic root of 66871586 is about 405.8951616840.

The spelling of 66871586 in words is "sixty-six million, eight hundred seventy-one thousand, five hundred eighty-six".