220688066 has 4 divisors (see below), whose sum is σ = 331032102. Its totient is φ = 110344032.

The previous prime is 220688029. The next prime is 220688081. The reversal of 220688066 is 660886022.

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

It can be written as a sum of positive squares in only one way, i.e., 204919225 + 15768841 = 14315^2 + 3971^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55172015 + ... + 55172018.

Almost surely, 2^220688066 is an apocalyptic number.

220688066 is a deficient number, since it is larger than the sum of its proper divisors (110344036).

220688066 is a wasteful number, since it uses less digits than its factorization.

220688066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110344035.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 220688066 is about 14855.5735668469. The cubic root of 220688066 is about 604.3097708565.

The spelling of 220688066 in words is "two hundred twenty million, six hundred eighty-eight thousand, sixty-six".