221665662 has 24 divisors (see below), whose sum is σ = 480617280. Its totient is φ = 73836000.

The previous prime is 221665657. The next prime is 221665679. The reversal of 221665662 is 266566122.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 28162 + ... + 35162.

It is an arithmetic number, because the mean of its divisors is an integer number (20025720).

Almost surely, 2^221665662 is an apocalyptic number.

221665662 is an abundant number, since it is smaller than the sum of its proper divisors (258951618).

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

221665662 is a wasteful number, since it uses less digits than its factorization.

221665662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8768 (or 8765 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 221665662 is about 14888.4405496345. The cubic root of 221665662 is about 605.2007730161.

The spelling of 221665662 in words is "two hundred twenty-one million, six hundred sixty-five thousand, six hundred sixty-two".