216398818917 has 44 divisors (see below), whose sum is σ = 325818260544. Its totient is φ = 143722904040.

The previous prime is 216398818901. The next prime is 216398818967. The reversal of 216398818917 is 719818893612.

216398818917 is a `hidden beast` number, since 216 + 398 + 8 + 18 + 9 + 17 = 666.

It is not a de Polignac number, because 216398818917 - 2⁴ = 216398818901 is a prime.

Its product of digits (10450944) is a multiple of the sum of its prime factors (13824).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216398818967) by changing a digit.

It is a polite number, since it can be written in 43 ways as a sum of consecutive naturals, for example, 15995518 + ... + 16009040.

Almost surely, 2^216398818917 is an apocalyptic number.

216398818917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

216398818917 is a deficient number, since it is larger than the sum of its proper divisors (109419441627).

216398818917 is an frugal number, since it uses more digits than its factorization.

216398818917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13824 (or 13797 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The spelling of 216398818917 in words is "two hundred sixteen billion, three hundred ninety-eight million, eight hundred eighteen thousand, nine hundred seventeen".