216809998726 has 8 divisors (see below), whose sum is σ = 326254024584. Its totient is φ = 108058657200.

The previous prime is 216809998703. The next prime is 216809998747. The reversal of 216809998726 is 627899908612.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173170300 + ... + 173171551.

It is an arithmetic number, because the mean of its divisors is an integer number (40781753073).

Almost surely, 2^216809998726 is an apocalyptic number.

216809998726 is a deficient number, since it is larger than the sum of its proper divisors (109444025858).

216809998726 is a wasteful number, since it uses less digits than its factorization.

216809998726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346342166.

The product of its (nonzero) digits is 47029248, while the sum is 67.

The spelling of 216809998726 in words is "two hundred sixteen billion, eight hundred nine million, nine hundred ninety-eight thousand, seven hundred twenty-six".