216205353447 has 16 divisors (see below), whose sum is σ = 296252730240. Its totient is φ = 140152380192.

The previous prime is 216205353437. The next prime is 216205353461. The reversal of 216205353447 is 744353502612.

It is not a de Polignac number, because 216205353447 - 2⁴ = 216205353431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216205353399 and 216205353408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216205353437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441513 + ... + 792050.

It is an arithmetic number, because the mean of its divisors is an integer number (18515795640).

Almost surely, 2^216205353447 is an apocalyptic number.

216205353447 is a deficient number, since it is larger than the sum of its proper divisors (80047376793).

216205353447 is a wasteful number, since it uses less digits than its factorization.

216205353447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235182.

The product of its (nonzero) digits is 604800, while the sum is 42.

The spelling of 216205353447 in words is "two hundred sixteen billion, two hundred five million, three hundred fifty-three thousand, four hundred forty-seven".