216183656 has 32 divisors (see below), whose sum is σ = 440627040. Its totient is φ = 98839488.

The previous prime is 216183641. The next prime is 216183659. The reversal of 216183656 is 656381612.

216183656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216183659) 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, 1415 + ... + 20841.

It is an arithmetic number, because the mean of its divisors is an integer number (13769595).

Almost surely, 2^216183656 is an apocalyptic number.

216183656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216183656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220313520).

216183656 is an abundant number, since it is smaller than the sum of its proper divisors (224443384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216183656 is a wasteful number, since it uses less digits than its factorization.

216183656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19553 (or 19549 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 216183656 is about 14703.1852331391. The cubic root of 216183656 is about 600.1700036786.

The spelling of 216183656 in words is "two hundred sixteen million, one hundred eighty-three thousand, six hundred fifty-six".