216543273738 has 64 divisors (see below), whose sum is σ = 484604208000. Its totient is φ = 63948834560.

The previous prime is 216543273721. The next prime is 216543273767. The reversal of 216543273738 is 837372345612.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313468 + ... + 728936.

It is an arithmetic number, because the mean of its divisors is an integer number (7571940750).

Almost surely, 2^216543273738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216543273738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242302104000).

216543273738 is an abundant number, since it is smaller than the sum of its proper divisors (268060934262).

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

216543273738 is a wasteful number, since it uses less digits than its factorization.

216543273738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415687.

The product of its digits is 5080320, while the sum is 51.

The spelling of 216543273738 in words is "two hundred sixteen billion, five hundred forty-three million, two hundred seventy-three thousand, seven hundred thirty-eight".