216985942277 has 4 divisors (see below), whose sum is σ = 233677168620. Its totient is φ = 200294715936.

The previous prime is 216985942267. The next prime is 216985942291. The reversal of 216985942277 is 772249589612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43785144001 + 173200798276 = 209249^2 + 416174^2 .

It is a cyclic number.

It is not a de Polignac number, because 216985942277 - 2¹² = 216985938181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216985942237) 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, 8345613152 + ... + 8345613177.

It is an arithmetic number, because the mean of its divisors is an integer number (58419292155).

Almost surely, 2^216985942277 is an apocalyptic number.

It is an amenable number.

216985942277 is a deficient number, since it is larger than the sum of its proper divisors (16691226343).

216985942277 is a wasteful number, since it uses less digits than its factorization.

216985942277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16691226342.

The product of its digits is 30481920, while the sum is 62.

The spelling of 216985942277 in words is "two hundred sixteen billion, nine hundred eighty-five million, nine hundred forty-two thousand, two hundred seventy-seven".