220687066 has 4 divisors (see below), whose sum is σ = 331030602. Its totient is φ = 110343532.

The previous prime is 220687057. The next prime is 220687067. The reversal of 220687066 is 660786022.

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., 115111441 + 105575625 = 10729^2 + 10275^2 .

It is not an unprimeable number, because it can be changed into a prime (220687067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55171765 + ... + 55171768.

Almost surely, 2^220687066 is an apocalyptic number.

220687066 is a deficient number, since it is larger than the sum of its proper divisors (110343536).

220687066 is a wasteful number, since it uses less digits than its factorization.

220687066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110343535.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 220687066 is about 14855.5399094075. The cubic root of 220687066 is about 604.3088580890.

The spelling of 220687066 in words is "two hundred twenty million, six hundred eighty-seven thousand, sixty-six".