216643893917 has 16 divisors (see below), whose sum is σ = 244616824320. Its totient is φ = 190084708800.

The previous prime is 216643893901. The next prime is 216643893931. The reversal of 216643893917 is 719398346612.

It is not a de Polignac number, because 216643893917 - 2⁴ = 216643893901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216643893017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724442 + ... + 978827.

It is an arithmetic number, because the mean of its divisors is an integer number (15288551520).

Almost surely, 2^216643893917 is an apocalyptic number.

It is an amenable number.

216643893917 is a deficient number, since it is larger than the sum of its proper divisors (27972930403).

216643893917 is a wasteful number, since it uses less digits than its factorization.

216643893917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703684.

The product of its digits is 11757312, while the sum is 59.

The spelling of 216643893917 in words is "two hundred sixteen billion, six hundred forty-three million, eight hundred ninety-three thousand, nine hundred seventeen".