216366646 has 8 divisors (see below), whose sum is σ = 324644040. Its totient is φ = 108151968.

The previous prime is 216366643. The next prime is 216366649. The reversal of 216366646 is 646663612.

It is an interprime number because it is at equal distance from previous prime (216366643) and next prime (216366649).

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

It is a junction number, because it is equal to n+sod(n) for n = 216366599 and 216366608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216366643) 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, 5811 + ... + 21598.

It is an arithmetic number, because the mean of its divisors is an integer number (40580505).

Almost surely, 2^216366646 is an apocalyptic number.

216366646 is a deficient number, since it is larger than the sum of its proper divisors (108277394).

216366646 is a wasteful number, since it uses less digits than its factorization.

216366646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31358.

The product of its digits is 186624, while the sum is 40.

The square root of 216366646 is about 14709.4067181515. The cubic root of 216366646 is about 600.3392951322.

It can be divided in two parts, 21636 and 6646, that added together give a palindrome (28282).

The spelling of 216366646 in words is "two hundred sixteen million, three hundred sixty-six thousand, six hundred forty-six".