216718197 has 8 divisors (see below), whose sum is σ = 289154880. Its totient is φ = 144380160.

The previous prime is 216718171. The next prime is 216718207. The reversal of 216718197 is 791817612.

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

It is not a de Polignac number, because 216718197 - 2¹² = 216714101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216718127) 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, 19372 + ... + 28437.

It is an arithmetic number, because the mean of its divisors is an integer number (36144360).

Almost surely, 2^216718197 is an apocalyptic number.

It is an amenable number.

216718197 is a deficient number, since it is larger than the sum of its proper divisors (72436683).

216718197 is a wasteful number, since it uses less digits than its factorization.

216718197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49323.

The product of its digits is 42336, while the sum is 42.

The square root of 216718197 is about 14721.3517382067. The cubic root of 216718197 is about 600.6642615452.

The spelling of 216718197 in words is "two hundred sixteen million, seven hundred eighteen thousand, one hundred ninety-seven".