66886439 has 4 divisors (see below), whose sum is σ = 67983000. Its totient is φ = 65789880.

The previous prime is 66886429. The next prime is 66886451. The reversal of 66886439 is 93468866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66886439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66886429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548189 + ... + 548310.

It is an arithmetic number, because the mean of its divisors is an integer number (16995750).

Almost surely, 2^66886439 is an apocalyptic number.

66886439 is a deficient number, since it is larger than the sum of its proper divisors (1096561).

66886439 is a wasteful number, since it uses less digits than its factorization.

66886439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096560.

The product of its digits is 1492992, while the sum is 50.

The square root of 66886439 is about 8178.4129878602. The cubic root of 66886439 is about 405.9252108917.

The spelling of 66886439 in words is "sixty-six million, eight hundred eighty-six thousand, four hundred thirty-nine".