216423553643 has 16 divisors (see below), whose sum is σ = 237369242880. Its totient is φ = 195690280800.

The previous prime is 216423553639. The next prime is 216423553679. The reversal of 216423553643 is 346355324612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 216423553643 - 2² = 216423553639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216423553594 and 216423553603.

It is not an unprimeable number, because it can be changed into a prime (216423553603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8089058 + ... + 8115768.

It is an arithmetic number, because the mean of its divisors is an integer number (14835577680).

Almost surely, 2^216423553643 is an apocalyptic number.

216423553643 is a deficient number, since it is larger than the sum of its proper divisors (20945689237).

216423553643 is a wasteful number, since it uses less digits than its factorization.

216423553643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30658.

The product of its digits is 1555200, while the sum is 44.

The spelling of 216423553643 in words is "two hundred sixteen billion, four hundred twenty-three million, five hundred fifty-three thousand, six hundred forty-three".