2278688666 has 8 divisors (see below), whose sum is σ = 3528292224. Its totient is φ = 1102591260.

The previous prime is 2278688663. The next prime is 2278688681. The reversal of 2278688666 is 6668868722.

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

It is not an unprimeable number, because it can be changed into a prime (2278688663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18376460 + ... + 18376583.

It is an arithmetic number, because the mean of its divisors is an integer number (441036528).

Almost surely, 2^2278688666 is an apocalyptic number.

2278688666 is a deficient number, since it is larger than the sum of its proper divisors (1249603558).

2278688666 is a wasteful number, since it uses less digits than its factorization.

2278688666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36753076.

The product of its digits is 18579456, while the sum is 59.

The square root of 2278688666 is about 47735.6121360143. The cubic root of 2278688666 is about 1315.9164946875.

The spelling of 2278688666 in words is "two billion, two hundred seventy-eight million, six hundred eighty-eight thousand, six hundred sixty-six".