216777197 has 16 divisors (see below), whose sum is σ = 267426432. Its totient is φ = 171115200.

The previous prime is 216777193. The next prime is 216777221. The reversal of 216777197 is 791777612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 216777197 - 2² = 216777193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216777193) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39947 + ... + 45047.

It is an arithmetic number, because the mean of its divisors is an integer number (16714152).

Almost surely, 2^216777197 is an apocalyptic number.

It is an amenable number.

216777197 is a deficient number, since it is larger than the sum of its proper divisors (50649235).

216777197 is a wasteful number, since it uses less digits than its factorization.

216777197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5588.

The product of its digits is 259308, while the sum is 47.

The square root of 216777197 is about 14723.3554939083. The cubic root of 216777197 is about 600.7187654684.

The spelling of 216777197 in words is "two hundred sixteen million, seven hundred seventy-seven thousand, one hundred ninety-seven".