216776677 has 8 divisors (see below), whose sum is σ = 236076120. Its totient is φ = 197852160.

The previous prime is 216776669. The next prime is 216776699. The reversal of 216776677 is 776677612.

It can be written as a sum of positive squares in 4 ways, for example, as 22982436 + 193794241 = 4794^2 + 13921^2 .

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 216776677 - 2³ = 216776669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216776677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216776627) 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, 92524 + ... + 94837.

It is an arithmetic number, because the mean of its divisors is an integer number (29509515).

Almost surely, 2^216776677 is an apocalyptic number.

It is an amenable number.

216776677 is a deficient number, since it is larger than the sum of its proper divisors (19299443).

216776677 is a wasteful number, since it uses less digits than its factorization.

216776677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187463.

The product of its digits is 1037232, while the sum is 49.

The square root of 216776677 is about 14723.3378348797. The cubic root of 216776677 is about 600.7182851380.

The spelling of 216776677 in words is "two hundred sixteen million, seven hundred seventy-six thousand, six hundred seventy-seven".