216897279999 has 4 divisors (see below), whose sum is σ = 289196373336. Its totient is φ = 144598186664.

The previous prime is 216897279913. The next prime is 216897280049. The reversal of 216897279999 is 999972798612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216897279999 - 2¹⁷ = 216897148927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216897279499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36149546664 + ... + 36149546669.

It is an arithmetic number, because the mean of its divisors is an integer number (72299093334).

Almost surely, 2^216897279999 is an apocalyptic number.

216897279999 is a deficient number, since it is larger than the sum of its proper divisors (72299093337).

216897279999 is an equidigital number, since it uses as much as digits as its factorization.

216897279999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72299093336.

The product of its digits is 555532992, while the sum is 78.

The spelling of 216897279999 in words is "two hundred sixteen billion, eight hundred ninety-seven million, two hundred seventy-nine thousand, nine hundred ninety-nine".