66871427 has 12 divisors (see below), whose sum is σ = 78954120. Its totient is φ = 56460096.

The previous prime is 66871381. The next prime is 66871463. The reversal of 66871427 is 72417866.

66871427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66871427 - 2¹⁰ = 66870403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (60871427) 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 in 11 ways as a sum of consecutive naturals, for example, 6902 + ... + 13467.

It is an arithmetic number, because the mean of its divisors is an integer number (6579510).

Almost surely, 2^66871427 is an apocalyptic number.

66871427 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66871427 is a deficient number, since it is larger than the sum of its proper divisors (12082693).

66871427 is a wasteful number, since it uses less digits than its factorization.

66871427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20450 (or 20443 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 66871427 is about 8177.4951543856. The cubic root of 66871427 is about 405.8948399859.

The spelling of 66871427 in words is "sixty-six million, eight hundred seventy-one thousand, four hundred twenty-seven".