216851611 has 8 divisors (see below), whose sum is σ = 218906624. Its totient is φ = 214802280.

The previous prime is 216851581. The next prime is 216851629. The reversal of 216851611 is 116158612.

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

It is a cyclic number.

It is not a de Polignac number, because 216851611 - 2¹⁵ = 216818843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216851681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124996 + ... + 126718.

It is an arithmetic number, because the mean of its divisors is an integer number (27363328).

Almost surely, 2^216851611 is an apocalyptic number.

216851611 is a deficient number, since it is larger than the sum of its proper divisors (2055013).

216851611 is a wasteful number, since it uses less digits than its factorization.

216851611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841.

The product of its digits is 2880, while the sum is 31.

The square root of 216851611 is about 14725.8823504739. The cubic root of 216851611 is about 600.7874946718.

The spelling of 216851611 in words is "two hundred sixteen million, eight hundred fifty-one thousand, six hundred eleven".