216666101 has 4 divisors (see below), whose sum is σ = 228069600. Its totient is φ = 205262604.

The previous prime is 216666097. The next prime is 216666103. The reversal of 216666101 is 101666612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216666101 - 2² = 216666097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216666103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5701721 + ... + 5701758.

It is an arithmetic number, because the mean of its divisors is an integer number (57017400).

Almost surely, 2^216666101 is an apocalyptic number.

It is an amenable number.

216666101 is a deficient number, since it is larger than the sum of its proper divisors (11403499).

216666101 is a wasteful number, since it uses less digits than its factorization.

216666101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11403498.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 216666101 is about 14719.5822291259. The cubic root of 216666101 is about 600.6161272806.

The spelling of 216666101 in words is "two hundred sixteen million, six hundred sixty-six thousand, one hundred one".