2187220666 has 8 divisors (see below), whose sum is σ = 3282670260. Its totient is φ = 1092997248.

The previous prime is 2187220631. The next prime is 2187220691. The reversal of 2187220666 is 6660227812.

2187220666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2174823225 + 12397441 = 46635^2 + 3521^2 .

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

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, 302071 + ... + 309226.

Almost surely, 2^2187220666 is an apocalyptic number.

2187220666 is a deficient number, since it is larger than the sum of its proper divisors (1095449594).

2187220666 is a wasteful number, since it uses less digits than its factorization.

2187220666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613088.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 2187220666 is about 46767.7310332669. The cubic root of 2187220666 is about 1298.0682682479.

The spelling of 2187220666 in words is "two billion, one hundred eighty-seven million, two hundred twenty thousand, six hundred sixty-six".