66710489 has 4 divisors (see below), whose sum is σ = 67398324. Its totient is φ = 66022656.

The previous prime is 66710473. The next prime is 66710551. The reversal of 66710489 is 98401766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28270489 + 38440000 = 5317^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 66710489 - 2⁴ = 66710473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66710389) 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 3 ways as a sum of consecutive naturals, for example, 343772 + ... + 343965.

It is an arithmetic number, because the mean of its divisors is an integer number (16849581).

Almost surely, 2^66710489 is an apocalyptic number.

It is an amenable number.

66710489 is a deficient number, since it is larger than the sum of its proper divisors (687835).

66710489 is an equidigital number, since it uses as much as digits as its factorization.

66710489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687834.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 66710489 is about 8167.6489273230. The cubic root of 66710489 is about 405.5689590060.

The spelling of 66710489 in words is "sixty-six million, seven hundred ten thousand, four hundred eighty-nine".