216750081277 has 4 divisors (see below), whose sum is σ = 229500086076. Its totient is φ = 204000076480.

The previous prime is 216750081253. The next prime is 216750081293. The reversal of 216750081277 is 772180057612.

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 202847548996 + 13902532281 = 450386^2 + 117909^2 .

It is a cyclic number.

It is not a de Polignac number, because 216750081277 - 2²³ = 216741692669 is a prime.

It is a super-2 number, since 2×216750081277² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216750081377) 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, 6375002374 + ... + 6375002407.

It is an arithmetic number, because the mean of its divisors is an integer number (57375021519).

Almost surely, 2^216750081277 is an apocalyptic number.

It is an amenable number.

216750081277 is a deficient number, since it is larger than the sum of its proper divisors (12750004799).

216750081277 is a wasteful number, since it uses less digits than its factorization.

216750081277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12750004798.

The product of its (nonzero) digits is 329280, while the sum is 46.

The spelling of 216750081277 in words is "two hundred sixteen billion, seven hundred fifty million, eighty-one thousand, two hundred seventy-seven".