216638632322 has 18 divisors (see below), whose sum is σ = 378020347497. Its totient is φ = 92843153424.

The previous prime is 216638632313. The next prime is 216638632361. The reversal of 216638632322 is 223236836612.

It can be written as a sum of positive squares in 2 ways, for example, as 145558273441 + 71080358881 = 381521^2 + 266609^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=329119.

It is a super-3 number, since 3×216638632322³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4584158 + ... + 4631174.

Almost surely, 2^216638632322 is an apocalyptic number.

216638632322 is a deficient number, since it is larger than the sum of its proper divisors (161381715175).

216638632322 is an frugal number, since it uses more digits than its factorization.

216638632322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94050 (or 47026 counting only the distinct ones).

The product of its digits is 746496, while the sum is 44.

The spelling of 216638632322 in words is "two hundred sixteen billion, six hundred thirty-eight million, six hundred thirty-two thousand, three hundred twenty-two".