216540232994 has 8 divisors (see below), whose sum is σ = 336010706460. Its totient is φ = 104536664176.

The previous prime is 216540232963. The next prime is 216540233009. The reversal of 216540232994 is 499232045612.

It can be written as a sum of positive squares in 2 ways, for example, as 197014362769 + 19525870225 = 443863^2 + 139735^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1866726089 + ... + 1866726204.

Almost surely, 2^216540232994 is an apocalyptic number.

216540232994 is a deficient number, since it is larger than the sum of its proper divisors (119470473466).

216540232994 is a wasteful number, since it uses less digits than its factorization.

216540232994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3733452324.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 216540232994 in words is "two hundred sixteen billion, five hundred forty million, two hundred thirty-two thousand, nine hundred ninety-four".