2278707666 has 8 divisors (see below), whose sum is σ = 4557415344. Its totient is φ = 759569220.

The previous prime is 2278707653. The next prime is 2278707703. The reversal of 2278707666 is 6667078722.

It is a sphenic number, since it is the product of 3 distinct primes.

2278707666 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189892300 + ... + 189892311.

It is an arithmetic number, because the mean of its divisors is an integer number (569676918).

Almost surely, 2^2278707666 is an apocalyptic number.

2278707666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2278707666 is a wasteful number, since it uses less digits than its factorization.

2278707666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379784616.

The product of its (nonzero) digits is 2370816, while the sum is 51.

The square root of 2278707666 is about 47735.8111484449. The cubic root of 2278707666 is about 1315.9201521045.

The spelling of 2278707666 in words is "two billion, two hundred seventy-eight million, seven hundred seven thousand, six hundred sixty-six".