216516677 has 4 divisors (see below), whose sum is σ = 233171820. Its totient is φ = 199861536.

The previous prime is 216516673. The next prime is 216516683. The reversal of 216516677 is 776615612.

216516677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 41589601 + 174927076 = 6449^2 + 13226^2 .

It is a cyclic number.

It is not a de Polignac number, because 216516677 - 2² = 216516673 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 (216516673) 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, 8327552 + ... + 8327577.

It is an arithmetic number, because the mean of its divisors is an integer number (58292955).

Almost surely, 2^216516677 is an apocalyptic number.

It is an amenable number.

216516677 is a deficient number, since it is larger than the sum of its proper divisors (16655143).

216516677 is a wasteful number, since it uses less digits than its factorization.

216516677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16655142.

The product of its digits is 105840, while the sum is 41.

The square root of 216516677 is about 14714.5056661785. The cubic root of 216516677 is about 600.4780236841.

The spelling of 216516677 in words is "two hundred sixteen million, five hundred sixteen thousand, six hundred seventy-seven".