216662011 has 4 divisors (see below), whose sum is σ = 216748224. Its totient is φ = 216575800.

The previous prime is 216662009. The next prime is 216662023. The reversal of 216662011 is 110266612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216662011 - 2¹ = 216662009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216662071) 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, 39220 + ... + 44401.

It is an arithmetic number, because the mean of its divisors is an integer number (54187056).

Almost surely, 2^216662011 is an apocalyptic number.

216662011 is a deficient number, since it is larger than the sum of its proper divisors (86213).

216662011 is an equidigital number, since it uses as much as digits as its factorization.

216662011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86212.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 216662011 is about 14719.4432978968. The cubic root of 216662011 is about 600.6123479855.

The spelling of 216662011 in words is "two hundred sixteen million, six hundred sixty-two thousand, eleven".