216506840299 has 8 divisors (see below), whose sum is σ = 221457277440. Its totient is φ = 211570732776.

The previous prime is 216506840273. The next prime is 216506840311. The reversal of 216506840299 is 992048605612.

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

It is a cyclic number.

It is not a de Polignac number, because 216506840299 - 2⁵ = 216506840267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216506840239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3551839 + ... + 3612280.

It is an arithmetic number, because the mean of its divisors is an integer number (27682159680).

Almost surely, 2^216506840299 is an apocalyptic number.

216506840299 is a deficient number, since it is larger than the sum of its proper divisors (4950437141).

216506840299 is an equidigital number, since it uses as much as digits as its factorization.

216506840299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164809.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 216506840299 in words is "two hundred sixteen billion, five hundred six million, eight hundred forty thousand, two hundred ninety-nine".