66589686 has 12 divisors (see below), whose sum is σ = 144277692. Its totient is φ = 22196556.

The previous prime is 66589673. The next prime is 66589687. The reversal of 66589686 is 68698566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66589687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1849696 + ... + 1849731.

It is an arithmetic number, because the mean of its divisors is an integer number (12023141).

Almost surely, 2^66589686 is an apocalyptic number.

66589686 is an abundant number, since it is smaller than the sum of its proper divisors (77688006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66589686 is a wasteful number, since it uses less digits than its factorization.

66589686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699435 (or 3699432 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 66589686 is about 8160.2503638062. The cubic root of 66589686 is about 405.3240022727.

The spelling of 66589686 in words is "sixty-six million, five hundred eighty-nine thousand, six hundred eighty-six".