665221614 has 16 divisors (see below), whose sum is σ = 1330717440. Its totient is φ = 221694840.

The previous prime is 665221589. The next prime is 665221643. The reversal of 665221614 is 416122566.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34017 + ... + 49875.

It is an arithmetic number, because the mean of its divisors is an integer number (83169840).

Almost surely, 2^665221614 is an apocalyptic number.

665221614 is an abundant number, since it is smaller than the sum of its proper divisors (665495826).

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

665221614 is a wasteful number, since it uses less digits than its factorization.

665221614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22855.

The product of its digits is 17280, while the sum is 33.

The square root of 665221614 is about 25791.8904696806. The cubic root of 665221614 is about 872.9488232486.

The spelling of 665221614 in words is "six hundred sixty-five million, two hundred twenty-one thousand, six hundred fourteen".