2220066778 has 4 divisors (see below), whose sum is σ = 3330100170. Its totient is φ = 1110033388.

The previous prime is 2220066763. The next prime is 2220066787. The reversal of 2220066778 is 8776600222.

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., 2169044329 + 51022449 = 46573^2 + 7143^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2220066778.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555016693 + ... + 555016696.

Almost surely, 2^2220066778 is an apocalyptic number.

2220066778 is a deficient number, since it is larger than the sum of its proper divisors (1110033392).

2220066778 is a wasteful number, since it uses less digits than its factorization.

2220066778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110033391.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 2220066778 is about 47117.5845942892. The cubic root of 2220066778 is about 1304.5338299624.

The spelling of 2220066778 in words is "two billion, two hundred twenty million, sixty-six thousand, seven hundred seventy-eight".