216401653366 has 4 divisors (see below), whose sum is σ = 324602480052. Its totient is φ = 108200826682.

The previous prime is 216401653337. The next prime is 216401653367. The reversal of 216401653366 is 663356104612.

216401653366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216401653367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54100413340 + ... + 54100413343.

It is an arithmetic number, because the mean of its divisors is an integer number (81150620013).

Almost surely, 2^216401653366 is an apocalyptic number.

216401653366 is a deficient number, since it is larger than the sum of its proper divisors (108200826686).

216401653366 is a wasteful number, since it uses less digits than its factorization.

216401653366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108200826685.

The product of its (nonzero) digits is 466560, while the sum is 43.

Adding to 216401653366 its reverse (663356104612), we get a palindrome (879757757978).

The spelling of 216401653366 in words is "two hundred sixteen billion, four hundred one million, six hundred fifty-three thousand, three hundred sixty-six".