216581677 has 8 divisors (see below), whose sum is σ = 233752064. Its totient is φ = 199484208.

The previous prime is 216581671. The next prime is 216581681. The reversal of 216581677 is 776185612.

216581677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 216581677 - 2⁷ = 216581549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216581671) 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, 11973 + ... + 24010.

It is an arithmetic number, because the mean of its divisors is an integer number (29219008).

Almost surely, 2^216581677 is an apocalyptic number.

It is an amenable number.

216581677 is a deficient number, since it is larger than the sum of its proper divisors (17170387).

216581677 is a wasteful number, since it uses less digits than its factorization.

216581677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36459.

The product of its digits is 141120, while the sum is 43.

The square root of 216581677 is about 14716.7142052837. The cubic root of 216581677 is about 600.5381070718.

The spelling of 216581677 in words is "two hundred sixteen million, five hundred eighty-one thousand, six hundred seventy-seven".