2170216666 has 8 divisors (see below), whose sum is σ = 3258612864. Its totient is φ = 1084012380.

The previous prime is 2170216661. The next prime is 2170216669. The reversal of 2170216666 is 6666120712.

It is a happy number.

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 (2170216661) 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, 545500 + ... + 549463.

It is an arithmetic number, because the mean of its divisors is an integer number (407326608).

Almost surely, 2^2170216666 is an apocalyptic number.

2170216666 is a deficient number, since it is larger than the sum of its proper divisors (1088396198).

2170216666 is a wasteful number, since it uses less digits than its factorization.

2170216666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095956.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 2170216666 is about 46585.5843153223. The cubic root of 2170216666 is about 1294.6956776097.

The spelling of 2170216666 in words is "two billion, one hundred seventy million, two hundred sixteen thousand, six hundred sixty-six".