216188398711 has 4 divisors (see below), whose sum is σ = 218924960800. Its totient is φ = 213451836624.

The previous prime is 216188398663. The next prime is 216188398721. The reversal of 216188398711 is 117893881612.

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 216188398711 - 2¹¹ = 216188396663 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 (216188398721) 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, 1368280926 + ... + 1368281083.

It is an arithmetic number, because the mean of its divisors is an integer number (54731240200).

Almost surely, 2^216188398711 is an apocalyptic number.

216188398711 is a deficient number, since it is larger than the sum of its proper divisors (2736562089).

216188398711 is an equidigital number, since it uses as much as digits as its factorization.

216188398711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736562088.

The product of its digits is 1161216, while the sum is 55.

The spelling of 216188398711 in words is "two hundred sixteen billion, one hundred eighty-eight million, three hundred ninety-eight thousand, seven hundred eleven".