66871149 has 16 divisors (see below), whose sum is σ = 96604992. Its totient is φ = 40981248.

The previous prime is 66871141. The next prime is 66871151. The reversal of 66871149 is 94117866.

It is not a de Polignac number, because 66871149 - 2³ = 66871141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66871149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66871141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13054 + ... + 17439.

It is an arithmetic number, because the mean of its divisors is an integer number (6037812).

Almost surely, 2^66871149 is an apocalyptic number.

It is an amenable number.

66871149 is a deficient number, since it is larger than the sum of its proper divisors (29733843).

66871149 is a wasteful number, since it uses less digits than its factorization.

66871149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30556.

The product of its digits is 72576, while the sum is 42.

The square root of 66871149 is about 8177.4781564979. The cubic root of 66871149 is about 405.8942775189.

It can be divided in two parts, 668 and 71149, that added together give a palindrome (71817).

The spelling of 66871149 in words is "sixty-six million, eight hundred seventy-one thousand, one hundred forty-nine".