2220571666 has 4 divisors (see below), whose sum is σ = 3330857502. Its totient is φ = 1110285832.

The previous prime is 2220571663. The next prime is 2220571679. The reversal of 2220571666 is 6661750222.

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., 2174263641 + 46308025 = 46629^2 + 6805^2 .

It is not an unprimeable number, because it can be changed into a prime (2220571663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555142915 + ... + 555142918.

Almost surely, 2^2220571666 is an apocalyptic number.

2220571666 is a deficient number, since it is larger than the sum of its proper divisors (1110285836).

2220571666 is a wasteful number, since it uses less digits than its factorization.

2220571666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110285835.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 2220571666 is about 47122.9420346396. The cubic root of 2220571666 is about 1304.6327149088.

The spelling of 2220571666 in words is "two billion, two hundred twenty million, five hundred seventy-one thousand, six hundred sixty-six".