216350640144 has 80 divisors (see below), whose sum is σ = 630275304640. Its totient is φ = 71040499200.

The previous prime is 216350640139. The next prime is 216350640151. The reversal of 216350640144 is 441046053612.

216350640144 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 5 + 0 + 640 + 1 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 216350640099 and 216350640108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3708457 + ... + 3766344.

It is an arithmetic number, because the mean of its divisors is an integer number (7878441308).

Almost surely, 2^216350640144 is an apocalyptic number.

216350640144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216350640144 is an abundant number, since it is smaller than the sum of its proper divisors (413924664496).

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

216350640144 is a wasteful number, since it uses less digits than its factorization.

216350640144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7474885 (or 7474873 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 216350640144 its reverse (441046053612), we get a palindrome (657396693756).

The spelling of 216350640144 in words is "two hundred sixteen billion, three hundred fifty million, six hundred forty thousand, one hundred forty-four".